Sheila was the only one,besides her parents,who knew that she was going to "lose " her sons,either than them going to live with their father and new girlfriend or to foster parents,and it didn't appear that she had much say in the matter over her future. Then to be told that she wasn't a fit mother would have been the last straw. Maybe Sheila knew herself that she DID struggle at times,but without the proper help it wasn't her fault. She was in a catch 22 situation where she took cannabis to help her through her day while she tried to manage her children and her home,and on top of her prescription drugs,it was making her worse.
People today would be supported and removal of children would be a last resort. The system as it was in the 1980's,let her down,the same as it has done today on occasion.
With the proper help and support,Sheila would have been able to have led a near-normal life.Her parents made a rod for their own backs by not speaking out about Sheila,or they'd have had the help which was so badly needed.