Distance yourself from her as much as possible. If u don’t need to see her, don’t.
If you don’t speak up now, this is gunna stay the same if not worsen after you say I do. Your fiancé needs to tell his mom to stop crossing boundaries.
UGHHHH, she sounds like a nightmare waiting to happen. No matter which of you speak up, she’s gonna make a federal case out of it by the sounds, but I would speak right up the next time she pulls one of her “mommy moments”. Good luck <3