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At the end of the day - this is none of your business.
Leave her alone.
Your brother will have to deal with his own issues, and she, with hers.
Realise that nobody outside the situation can actually 'fix' anything.
Let him know that you are fully supportive of him, amd that if he needs you, you'll be there for him.
Then step away, and be there if needed.
Thi is simple, but by no means easy.
However, there isn't realistically anything else you CAN do.
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