Mother in Law is a victim, and is victimizing

Dear Glow,

I’ve had a really bad relationship with my Mother in Law (MIL) for the past four years. I find her to be very dominating/controlling/emotionally manipulative, and have difficultly feeling like I can be myself or even breathe around her.

The thing is, she just found out that her husband has been cheating on her. She’s dragging both of her sons into this, and telling them every detail of the emails and text messages that she found from the ‘other woman.’

I know that my MIL is actually the victim in this scenario, but I know this is a person who will also take this as an opportunity to play the victim to get everyone on her side/get her sons attention. I want to be able to support her while she is going through this awful time, but not in a way that will enable her to start controlling my/my husband’s life. Any advice?