Okay, I found a public tree on Ancestry which said that Florence is in Southampton on the 1939 Register, a paid companion. She is shown as married but her husband isn't there. Date of birth 20 Mar 1886 which fits with the Birkenhead birth - also the public trees say that the Florence who married Robert Corlett is the one born 1886 Birkenhead. This tree has a photo of her:
https://www.ancestry.co.uk/family-tr...08577025/facts