Sorry! I had to take my son to work. Yes, it's in Surrey. They also lived in Essex, and I had them mixed up.
She was born to unmarried parents. Father's name was Eccles and mother was Collins, so she was registered as `female Eccles' and also as `female Collins'. Her death was registered as `female Collins'. The parents married 2 years later. She was raised in a foundling home, never knowing her family. Her family wasn't poor and all the other children stayed with the parents. There were 6 children altogether and the 1911 census says the mother had 6 children, with 5 still living and 1 dead (all 6 were alive).
We have the birth certificate and the death certificate. The birth certificate, issued in the 1940s lists her name (she must have been able to prove she was that baby). The death certificate shows the same death date as was her birthdate in Aug 1900. She was born 9 months, 11 days after her sister (she must have been premature).
I made another post about this individual a couple years ago, but we were trying to figure something else out. It was a HUGE help. Since I am really just trying to figure out how this mistake could have happened (what process was used), I didn't think it was related. Sorry if that's wrong!