I have seen this sort of behaviour used against my sil. Her husband of 40 years kept her in much the same way. All her salary went into his account and he would give her £100 per month to spend on food for the family.
Five years ago she met someone, left my bil and now has a life where she is now at peace with herself and her new life.
They are now divorced, got half his pension, half the house and savings. I used to be a pension administrator and in theory the couple will have all assets including pensions split equally. It is up to the court to decide how the pension is split and will involve actuaries to make calculations. It's an expensive process so be sure to have some money set aside.
Never mind you mother, this is YOUR life not hers. Go live it before it's too late!!
Good luck, and I sincerely hope you will find a new life that you deserve.