Do it. If you don't do it i will personally come out to where ever the hell you live and punch you for not doing it. If only I knew where you lived and if I had the means of getting there. Which I don't. Still, if it happens, just tell them everything.
It's all I can do really. No matter what happens she is probably going into a nursing home, but I will be damned if I am seen as a mother abuser.