Monster in law 🤬

So its going its going to be a long story. I’ve been married to my husband 8 years and his mother is a narcissist person. She’s bipolar though because some moths she’s awesome and supportive etc.. well few months ago she found my 16 year old with a boy over the house and she said some very hurtful stuff to her and tried hitting her with a vacuum stick in which my husband stoped her from doing she was so pissed off because my husband didn’t let her hit his sister (it was metal stick) she was calling her a whore saying all lots of nasty things to them both after. It’s been 3 months since they have spoke to her. We just found a letter his sister had wrote for the family... a Suicide note... for her mom when that happened in which she says those things she said basically killed her. IM SO GLAD SHE DIDN’T kill herself. Me and my husband moved her in with us shortly after that had happened so maybe that’s why she didn’t and I’m so happy she didn’t we had no idea she had written that letter. She’s been laughing with us she spends all day with us we love her! We are expecting baby number 2 as well she’s exited. She’s seems very happy living with us. I just wish I could go scream at my mother in laws face because she’s always judging everyone meanwhile she is no angel! I hate how she is so mean to her kids all 4 have tried to take their lives before and I’m not saying it’s all her fault but she has a big part because she’s always talking down on them. When is she ganna stop does she not realize the hurt she is causing. I’m just so mad I wish I could tell her off so bad but it’s not my place I just hate it how no one is saying shit to her.