There are several ancestry trees which have Cissy Lucy Tully as the daughter of William Edward Tully and Florence Louisa Ashlin , however the birth record in Kensington in 1907 doesn't match.
Cissy TULLY 2Q 1907 Kensington 1A 132 mmn AYLOTT . Robert TULLY married Emily AYLOTT 4Q 1889 Kensington 1A 193.Cissy can be found in 1911 and 1921 with Robert and Emily. There is no Cissy with William and Florence.
The death record for Cissy Lucy GARDNER in 1985 appears to point to the marriage of Cissy ( or Celia ) Lucy ILES to John Alfred GARDNER 13 Feb 1932 Wandsworth.
I am confused

Edit - Are we actually looking for Winifred A TULLY ?