Hi need some help

tracing some one her name is Emily Dorothy Overton (Nee Stubbs) born 1868 (or though she is down in census as 1869) Cannock Staffordshire i have found all census records for her and have her birth and marriage certificate the info i need help with is this after having a child Harry stubbs b 1897 whom was illegitimate with a harry mason who died before the child was born she married a Thomas overston (a butcher and moved to Shropshire Wolverhampton giving her son to her friend to raise and having a daughter in 1900 called Dorothy Kate overton i was told by Harry's Stubbs daughter my grandmother that Emily Dorothy (nee Stubbs) went mad and was sent of to a local asylum where she thinks she died Emily daughter was given to Emily's Sister Annie stubbs to raise What i need to find out is did Emily go mad if so did she get committed and if so where when and were did she die as i was told it was around 12 but this might not be true i cant find any recolds on her death on the BMD index have searched for both stubbs and Overton i even tried Dorothy Overton and stubbs as she used Dorothy as a first name on her sons certificate to cover up his birth can any one help me find out what happened to poor Emily Dorothy (nee Stubbs) Overton

many thanks

Hazel