Her birth index:

Name:                           Mother's Maiden Surname:
CARROLL, URSULA MARY JEAN       HAMILTON  
GRO Reference: 1908  S Quarter in BROMLEY  Volume 02A  Page 571
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In 1939 she was at 99 Old Brompton Road, South Kensington, London:

               Last                                           Marital
First name(s)  name(s)  DOB          Sex     Occupation       status   Schedule  Schedule Sub Number
Ursula M J     Wilson   01 Jul 1908  Female  Unpaid Domestic  Married  4         1
                                             Duties
Robert M       Wilson   23 Nov 1885  Male    Power Plant      Married  4         2
                                             Engineer 1906
                                             Speciallity
                                             Salesman 1928-3

Ref: RG101/0309E/002/6
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At marriage she was 30, so she could easily have produced children over the following ten years from 1939 to 1949.  Find my past shows 16 Wilson births with Carroll mothers.  Assume that they could have moved from Kensington to anywhere within 50 miles of London, this reduces the number of births to five, of which one definitely clashes with another. being born in the same year and in different places.  Of the four remaining all are girls which conforms to the apparent proclivity of her mother and her sister to produce only girls.

The four remaining are:

1. Jennifer C     1942    Brentford, Mx
2, Sylvia         1946    Hatfield
3. Barbara A      1948    Hatfield
4. Denise P       1949    Hatfield

I need a little more evidence that this to be reasonably certain.  Perhaps a major spend of £11 on the birth certificate for the first in the list?  Ordered on May 13 2021.

Received after 21st May 2021: it is not for this pair of Wilson and Carroll, but a different on the father Reginald Archer Wilson and the mother being Eileen Edna Wilson formerly Carroll.  As she did not even mention any children in her will, I suspect this was because she did not have any, so I am saving myself more expenditure on certificates.
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She died in 1941.  And that eliminates all the above births!

Her death index:

First name(s)  Ursula M J
Last name      Wilson
Gender         Female
Birth year     1908
Age            33
Death quarter  1
Death year     1941
District       Essex South Western
County         Essex
Volume         4A
Page           326
Country        England
Record set     England & Wales Deaths 1837-2007
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Her probate index:

1941
WILSON Ursula Mary Jean of The Chalet Sunnycroft gardens Granham Gloucestershire (wife of Robert Macgregor Wilson) died 28 March 1941 at Essex County Hospital Wanstead Essex  Probate Llandudno 7 October to the said Robert Macgregor Wilson mechanical and electrical engineer.
Effects £6795 17s. 10d.  Resworn £6878 0s. 4d.

Her will has been ordered to see if it shows any children.
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The will has arrived on the 28th April 2021 and in it she leaves everything to her husband Robert Macgregor Wilson of 17 Clovelly Court, Hornchurch, Essex, mechanical and electrical engineer.
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Their marriage index:

First name(s)       Ursula M J
Last name           Carroll
Marriage quarter    3
Marriage year       1938
MarriageFinder      Ursula M J Carroll married one of these people
                    Robert M Wilson
Spouse's last name  Wilson
District            Kensington
County              London
Country             England
Volume              1A
Page number         668
Record set          England & Wales Marriages 1837-2005
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