I wonder if this might be Evelyn
1939 register living Finchley M.B., Middlesex her middle initial transcribed ‘A’ original looks to be an 'F', her dob is the same as on the 1907 baptism for Evelyn Frances Martin dob 14 Aug 1899
Dec 1921 Willesden
Raymond F Lane
Evelyn F Morley
EDIT to add
Year 1939 Electoral Register Finchley West
Evelyn Frances Lane
Address 105 Dollis Park
Added - Mitche11 - obtaining the m/c would be the only way of knowing if she is the correct person, it looks as if she travelled to US in 1947 and died in the US in 1973 (same dob 14/8/1899)
I won't add all the details on here just in case she's not related to your family - she had at least four children.