Eileen,
According to one of the books on my shelf (Ancestral Trails), in some parts of England about 15% of births were not registered between 1837 and 1875. These areas included Surrey & Middlesex. There were no penalties for not registering the birth of a child before 1875. After this date, a fine was imposed for late registration (more than 42 days after the birth). This led to parents reporting incorrect dates of birth to avoid the fine. I wonder if something similar may have happened here. Perhaps she was baptised before her birth was actually registered. Is her birth registered in the next quarter - faint hope. Otherwise, she may never have been registered at all - I'm still struggling with my 2x gt grandfather. All his siblings seem to appear in the GRO indexes but not him. There are apparently entries missing from the national indexes; the local indexes may be better.
Hope you find it eventually.
Nell
PS I understand that Maud and Mathilda were considered interchangeable as names in medieval times, don't know if that was still the case in Victorian times.
