I couldn't read more than a few sentences of the description of what she did.
Sounds like a recurring pattern of abuse/neglect. The mother herself was brought up in a debauched, amoral environment with a father (probably a sociopath) that made her drink alcohol at the age of eight.
Social services should be the one lifeline that children (who aren't lucky enough to have human beings as parents) have. It's nothing short of a tragedy when they no longer work.