No birth registration found.

Her baptism index transcript, by Ada Brady:

First name(s)           Evelyn Marian Atherton
Last name               Adams
Baptism year            1870
Baptism date            17 Jul 1870
Father's first name(s)  Henry Atherton
Father's last name      Adams
Father's occupation     Gentleman
Mother's first name(s)  Mary Louisa
Place                   Magdalen Laver
Residence               Magdalen Laver
County                  Essex
Country                 England
Archive                 Essex Record Office
Archive ref             D/P 62/1/4
Record set              Essex Baptisms

Birth confirmed from 1871 and 1901 censuses and her marriage in Q2 of 1895.
____________________

In 1901 she, her husband and four children were at The Heath, Hatfield Broad Oak, Dunmow, Essex:

                                Marital
First name(s)  Last name  Role  status  Gender  Age  Birth year  Occupation  Birth place
Thomas Wilfred          Reynolds  Head  M  M  30  1871  Clerk in H Orders  High Wycombe, Bucks
Evelyn Marion Atherton  Reynolds  Wife  M  F  30  1871  -                  Wynters Harlow Essex
Amy? Mary Barbara       Reynolds  Daur  -  F   4  1897  -                  Hatfeild B-Oak, Essex
Eve? Frieda Margach     Reynolds  Daur  -  F   3  1898  -                  Pershore, Worcs
Jessica Marion          Reynolds  Daur  -  F  1½  1900  -                  Hatfeild B-Oak, Essex
Thomas Henry Atherton   Reynolds  Son   -  M  4m  1901  -                  Hatfeild B-Oak, Essex
Agnes                   Martin    Serv  S  F  27  1874  Cook               Hatfeild B-Oak, Essex
Sarah Annie             Lye       Serv  S  F  28  1873  Nurse              Dumberton, Somerset
Edith                   Cowell    Serv  S  F  24  1877  Housemaid          Tiverton, Cornwall
Ethel                   Archer    Serv  S  F  17  1884  Nurse              Brentford, Middlesex

Ref:
Archive reference  RG13
Piece number       1731
Folio              26
Page               5
Combined:          1901 ref: RG13, piece 1731, folio 26, p. 5
__________________

In 1911 she and her children are nowhere to be found.  Her husband was listed totally on his own in the 20-room vicarage at Prestwood, Great Missenden, Bucks.  I get the impression that she and all the staff had recently walked out or been thrown out.
__________________

In 1921 she, Evelyn M Atherton Reynolds, was definitely at Cricklade, Wilts in a household of 14 people.  This was the family of Frederick and Anne Bulley and seem like relations of her mother who had been born as mary Louisa Bulley.

I have not searched for her children as it is £4 or so a pop.  Leave it until the price comes down.
__________________

In 1939 she had two daughters only with her at The Grange, Lower Road, Westbury, Wilts:

                                                              Marital  Schedule
First name(s)  Last name(s)  Birth date  Sex  Occupation      status   Main  Sub
Evelyn M A    Reynolds  24 May 1870  F  Private Means           M       34    1
Amyand M B    Reynolds  10 Jan 1897  F  Unpaid Domestic Duties  S       34    2
Mavis Y       Reynolds  19 Sep 1906  F  Unpaid Domestic Duties  S       34    3
           (later Fyers-Turner)
Verlie A      Muspratt  15 Nov 1918  F  Cook                    S       34    4

1939 ref: RG101/7173A/005/23

If she was married, where was her husband?  And where were they in 1911?
__________________

From all the above, her children are:

(a) from the 1901 census:
First name(s)  Last name  Role  status  Gender  Age  Birth year  Occupation  Birth place
Amy? Mary Barbara       Reynolds  Daur  -  F   4  1897  -                  Hatfeild B-Oak, Essex
Eve? Frieda Margach     Reynolds  Daur  -  F   3  1898  -                  Pershore, Worcs
Jessica Marion          Reynolds  Daur  -  F  1½  1900  -                  Hatfeild B-Oak, Essex
Thomas Henry Atherton   Reynolds  Son   -  M  4m  1901  -                  Hatfeild B-Oak, Essex

(b) from the 1939 Register:
                                                              Marital  Schedule
First name(s)  Last name(s)  Birth date  Sex  Occupation      status   Main  Sub
Mavis Y       Reynolds  19 Sep 1906  F  Unpaid Domestic Duties  S       34    3
           (later Fyers-Turner)

A total of five children, as stated by their father in the 1911 census.

The GRO Online birth registrations are:

Name:                                    Mother's Maiden Surname:
   REYNOLDS, AMYAND MARY BARBARA         ADAMS  
GRO Reference: 1897  M Quarter in PERSHORE  Volume 06C  Page 358
   REYNOLDS, EVELYN FRIEDA MARGARET      ADAMS  
GRO Reference: 1898  J Quarter in DUNMOW  Volume 04A  Page 733
   REYNOLDS, JESSICA MARION              ADAMS  
GRO Reference: 1899  D Quarter in DUNMOW  Volume 04A  Page 790
   REYNOLDS, THOMAS HENRY ATHERTON       ADAMS  
GRO Reference: 1901  M Quarter in DUNMOW  Volume 04A  Page 855
   REYNOLDS, MAVIS YOLAUDE               ADAMS  
GRO Reference: 1906  D Quarter in WYCOMBE  Volume 03A  Page 916
_______________________

Her death index:

Name:                                  Age at Death (in years):  
REYNOLDS, EVELYN MARION ATHERTON       83  
GRO Reference: 1953  S Quarter in DEVON CENTRAL  Volume 07A  Page 264
__________________

Her probate index:

1953
REYNOLDS Evelyn Marion Atherton of Newholme Barns-road Budleigh Salterton Devonshire widow died 18 August 1953  Probate Exeter 4 November to The Public Trustee and Mavis Yolanda Reynolds spinster.  Effects £2726 10s. 1d.

Will ordered.
__________________

I wonder how Mavis Yolanda got involved with the public Trustee?  Was she a minor?
__________________

In the probate it does not explain what the public trustee was doing.  [ Aha, half an explanation. ]
__________________

The will was dated 31st July 1951 and appointed the Public Trustee and her daughter Mavis Yolania Reynolds as Executors.  She listed the following family and other relations:

1, Her dear daughter Mavis Yolanda Reynolds,
2. Her father Henry Atherton Adams who d. 24 Sep 1897,
3. Her daughter Mrs Freda Oaks [ sic ],
4. Her son,
5. Her daughter Amyas Barbara,
6. Her daughter Jessie Marion,
7, Her husband.

and she referred to many family trusts including one made by her father and it may be because of these that she had got the Public Trustee involved.
___________________

Their marriage index:

First name(s)     Evelyn Marion A
Last name         Adams
Marriage quarter  2
Marriage year     1895
Marriage Finder   Evelyn Marion A Adams married one of these people
                  Thomas Wilfrid Reynolds, Sarah Jane Linsell, James Goodwin
District          Epping
County            Essex
Country           England
Volume            4A
Page number       441
Record set        England & Wales Marriages 1837-2005
__________________

Transcript of the Marriage Register by Ada Brady, provided by FindMyPast

First name(s)                    Evelyn Marion Atheron
Last name                        Adams
Marital status                   S
Residence                        Harlow
Marriage year                    1895
Marriage date                    27 Jun 1895
Place                            Harlow, Ss Mary & Hugh
Spouse's first name(s)           Thomas Wilfred
Spouse's last name               Reynolds
Spouse's marital status          B
Spouse's residence               Harlow
Father's first name(s)           Henry Atherton
Father's last name               Adams
Father's occupation              Engineer
Spouse's father's first name(s)  Thomas John
Spouse's father's last name      Reynolds
County                           Essex
Country                          England
Archive                          Essex Record Office
Archive reference                D/P 32/1/7
Event type                       Marriages
Page number                      222
Record set                       Essex Marriages And Banns 1537-1935
___________________________________