Unless you find some other evidence I wouldn't assume that your mother was born in the Institution. There must be about 400/500 yards of road before the first numbered building today (No 56 I think it was) and as I said the old map shows there was a row of houses near the hospital building.
If it turns out she was born there, she has had some celebrated people following in her wake: the main (listed) building is now luxury flats. Charlotte Church had one of them before buying a house and moving in with her Gav, while Billie Piper rented another while filming Dr Who.
Regards, Gareth