Mil issues

There is nothing to do. This is something your FH must solve

Blood speaks to blood is the best policy for discussing conflict in general circumstances. Of course there are exceptions. FH must set boundaries and ask his mother to refrain speaking negatively about you and to you.

I know you are done with your mother in law but that is your fh mom and she will most likely be involved in your life forever and will be your children's grandmother, you fiancé need to sit down and set boundaries

There is nothing you can do. Your fiancé is the one that needs to speak to his mom about this. He shouldn't let her say the things she has. Boundaries need to be set. In the meantime, I wouldn't discuss anything wedding related with her because she clearly doesn't support your marriage.

FI needs to set boundaries. And one is that you two are becoming your own new family. You now have a bond with each other more than in casual dating. If they talk badly to you or about you, their son will not come to see them, nor will they get to know their grandchildren. So FMIL needs to decide to be civil, or lose her son. And FFIL needs to talk with his wife. And work out whether or not he will ever get to see his son and family. Which
depends on FMIL saying something nice or nothing at all to or about you. You are asking for basic good manners, not regular unpleasantness. FMIL knows she is over the line. As long as her son accepts it, she has the power, and his tacit permission to be as nasty as she wants to be. FI needs to act to stop it. Just as you would be defending him from any family or friends of yours.

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I agree with this here. He should put her in her place. She may not like you but she needs to respect that you are marrying her son and respect you. I feel you tried to include her so I agree no more wedding talk. I would honestly distance myself. She only needs to be there day of and maybe this is me being petty I would have your fh communicate wedding day information with her. I would not talk to someone that disrespected me like that unless she makes amends.

My MIL is awful too, she is veryyyy gossipy, selfish, and judgmental. I try to keep my distance from her and so far thats worked without me having to tell my husband or her that I cant stand her lol. Some people are just difficult. Tell yourself not to take it personal. After all, if you are going to spend your life with FH shes gonna be around for a while so in this case its probably best to bite your tongue and vent elsewhere

Agree with the others- your fiancé needs to speak to his mother.

I agree your fiancé needs to speak with his mother. There might also be some underlying issues she’s taking out on you.