Not found in 1901 or 1911 censuses.

BUT FOUND in 1939, giving her birth date, and with her husband and eldest son and possibly a younger child at 18 Southampton Road, Fareham, Fareham U.D., Hampshire:

First name(s)  Last name(s)  Birth date  Sex  Occupation  Marital status  Schedule  Schedule sub number
Robert M     Stopford  16 Jul 1890  M  Commander R Navy           Married  123  1
Elsie H      Stopford  29 Jan 1898  F  Unpaid Domestic Duties     Married  123  2
Michael R H  Stopford  27 Apr 1921  M  Army Officer Cadet 689908  Single   123  3
Gladys G     Ball      12 Dec 1908  F  Cook                       Single   123  4
The record for this person is officially closed.

1939 ref: RG101/2333D/010/25

Their son stephen was found with his paternal grandmother in this 1939 Register.  But I don’t think the youngster who is redacted will be Robert and Elsie’s daughter. If their daughter had been there, she would have been listed immediately after her elder brother.  So the redacted person is more likely to have been a servant.
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Her death index:

First name(s)  Elsie H
Last name      Stopford
Gender         Female
Birth year     1897
Age            70
Death quarter  4
Death year     1967
District       Surrey South Western
County         Surrey
Volume         5G
Page           463
Country        England
Record set     England & Wales Deaths 1837-2007
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No will found.
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The 1939 Register records them as a married couple.