<human>: I'm currently having some pretty bad problems with my real mother. She is driving me crazy and I'm pretty close to just tellling her she won't be allowed at my wedding.

A little backstory, I'm 23 and met a wonderful girl at college. Over this last summer, I went to Florida with her family for a vacation and I proposed to her in Disney world by the Cinderella's castle's wishing well.

We took photos together and did some photos with her family as well. When we got back to MN we took some pictures for holiday cards for her side of the family to announce I was going to be a new member of the family.

My mother never saw any of these but she did voice concern over me getting engaged to this girl. She told me she didn't like her and that she wasn't worth my time and all that jazz. She complains about her constantly and once in a while spends the night at my house and whenever my fiance isn't in the room, my mother whispers at me all sorts of negative things about her. It's frustrating and I have told her to stop or I won't let her come over. She takes offense and one time stormed out proclaiming she is going to disown me just like I'm disowning her.

 Well just today my mother must have been stalking my facebook because she saw the holiday card photo that my soon to be mother in law posted on facebook and tagged me in.

My mom messaged me and told me how she's not happy about it and I must be forgetting who my real family is. She then started yelling at me over facebook being beligerant telling me my last name isn't (Insert Fiance's last name here) and I should forget about them. and then she goes on the photo and starts posting nasty remarks about my soon to be family. 

She's acting like a complete child and I don't know what to do.

Provide a brief overview of the text.
<bot>: My mom is being a complete butt to my Fiance, her family and me, and I don't know what to do.