How do I not give BSC SIL so much headspace?

This is a skill I REALLY need to learn and I am hoping some of you ladies could offer some tips.


DH's brother's wife is BSC. Shs

She's truly mentally unstable but refuses to get help. Even her DH has told me she is "psycho" and "unstable" but he loves her and enables her crazy.


Most of the family rug sweeps to keep the peace. I'm sick of it.


She has had several temper tantrums, most recently tonight. She interprets what people say to make it the most offensive towards her so she can freak out. Tonight she was freaking out about something DH said to her that she decided was incredibly offensive. She ranted and raved and then when MIL tried to tell her that she was misinterpreting and she needed to calm down, SIL flipped on MIL.(not the first time)


I know she's crazy. The whole family knows she's crazy. But I can't get her out of my mind. I think about all the things I would love to say. She just takes SOOOOO much of my headspace.


Any tips on how to stop myself from thinking about her crazy all the time?


I could write a novel filled with noms. Let me know if your llamas are hungry.