Toxic Mother in law 😥

How do me and my husband go about our relationship with his mother? She has been toxic and draining: talking bad about me to other family members, verbally abusive to my husband, opening loans and credit cards in his and his sibling’s names, etc. I fear my husband has been conditioned to accept this behavior because he’ll be upset for a while then he’ll talk to her again as if nothing happened. When she is addressed of these issues she plays victim, lies, or brushes it off. She briefly went to therapy when ALL of her children were going no contact (this only lasted a week) but stopped once they began talking to her again. I’m the only one who doesn’t put up with it and chooses not to be around her. I don’t allow my children to be alone with her because I simply don’t trust her and don’t want her bad mouthing me around my kids. And of course she plays victim and cries about it to the family. I do allow her to visit them with me there to avoid so much drama. Not sure what else she needs to do for my husband to distance himself from her. It’s affecting our marriage as most of our arguments stem from her and we have debt because of her…