OK - I think this is the birth for Flora Fisher (dau of George on 1881 census):
Births Sep 1874 - Wisbeach 3b 594
FISHER Flora
That would seem to rule her out as your Florence Eliza, even if yours shortened her name to Flora at times.

The ref. I gave you on my previous post is probably for the Florence Eliza dau of Howard, b. Wimblington, as North Witchford reg. district covers that area. We can rule her out too.

On the 1901 census, she says she was born in Cambridge, but there's no Florence/Flora/Florrie Fisher b. Cambridge on the censuses except one b. 1890ish...

It's possible that her father George died, mother remarried, and Florence is on censuses under step-father's name - that wasn't uncommon. I can see far too many Florence E Somethings b. Cambridge 1865-75, but perhaps we can match one of the names to a Fisher marriage? Have a look at the 1881 and see if anything grabs you - I'll give the 1871/1891 a go this afternoon if the kids keep quiet...
Rambler
