I think my mom is going insane?

Ananchor
She has a history of depression and a history of lashing out verbal abuse and emotionally she guilt manipulates people regularly.
She had to go to mandated therapy through her work (she was a second grade teacher) because she told a coworker "you know the sad part is even if I killed myself it wouldn't help my daughters"
which by the way we are grown women who either have jobs or families and none of us need help in anyway...
God knows what she told the therapist or what the therapist actually told her but she told us the woman said her problems were "because we didn't support her enough and we don't make her life easy and so it's our fault she's crazy. "
She ended up quitting teaching because she said it was too hard.
My sister who is a stay at home, her husband and 2 kids had to move in with her to help with bills... About a week ago my mom came to her crying and mad asking why she has to get a job because she thought when they moved in it meant she wouldn't have to work and they would just take care of her. And then she could do whatever she wanted.
I moved in with my grandfather after my grandmother died because my fiancée is deployed and now she holds that against me because I get to live here for free (I've offered him rent bills food and he refuses them all time and time again)
she has been storing stuff here that she finds at thrift stores and wants to sell for years off and on, my grandfather hates clutter and she will leave it here for months or weeks at a time them when he moves it or gives it away she gets angry saying he can't throw her stuff away. Even if he's told her to move it over and over again.

I don't know what to do. She keeps doing and saying the same insane things over and over again. That we need to help her, our lives are too good, we have it so good. She believes she's the only one with valid problems. She will call me up just to yell at me, anytime I see her all she does is yell and say how she never sees me and I'm cold. She refused to keep going to the therapist and she refused to keep taking the meds they put her on. And the meds did actually help. The only way I can stand being around her is to be cold
I think my mom is going insane?
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