NTA

Congrats on your wedding!

You have to admit that your mother is a very insecure person. Not to mention a control freak (bc of it). But I don't think you should cut ties with her either. Obviously you do care about her and even though you would like her to be less (much less) intense and plain anti-semitic. The reason is bc even if she might have gotten into therapy in order to have contact with you, well, she's giving into your requests, perhaps falsely, but you're gaining leverage to negotiate a lot more than you'd think.

You definitely can't allow her to blackmail you when you feel the situation is unfair to you and your soon to be husband.

I can't say that this would likely keep happening, but it'd be interesting to know where her biased opinion comes from. Did she grow up in a slavic country? Historically some of this ethnicities were heavily brainwashed by anti-semitic propaganda during and after WW2.

I'm not excusing her behavior at all it just seems like Malcolm's in the middle grandma hating on everyone therefore the stereotype given to this character.