Apologies in advance for a rant.
My fiance and I were engaged in October after 7 months of living together, and 1.5 years of being together. At the time his sister and I were EXTREMELY close. Post engagement, there seemed to be some kind of a shift - it all started when fiance & I left a family party earlier than FSIL deemed acceptable. He and I both received emails where she stated how unfair we were to her, how we should always consider her needs, and that she found this to be completely unacceptable and stated that we need to correct this in the future (and mentioned to him that he needed to spend less time with me and commit to at least one day/wk for a "sibling date"). I responded back, apologizing for hurting her feelings, but also stated that at that point, fiance and I had been at the family event for 8 hours, and that there needed to be mutual respect of one another's time.
I thought that had cleared the air, I even brought her and FMIL to try on wedding dresses along with my mom, where FSIL proceeded to show my mother pictures of the dress she had worn during her wedding (5 years ago) throughout the entire hour I was at the bridal salon. Every time someone asked fiance & I about our wedding, she would cut us off and talk about her wedding, monopolizing the conversation.
During this time, she also informed me that if she was pregnant during our wedding, no one on her side of the family would care about the wedding, because everyone would be focused on her and she can't wait for all of that attention.
On NYE, she accidentally (drunk) sent me a text about me that she had meant to send to someone else, where she referred to me as a "contrived bitch" who was taking her brother from her.
She and I ended up sitting down and again, I thought cleared the air as best as possible and was hopeful that we could move on, but nothing has been the same since.
In her credit, she IS planning the bachelorette/bridal shower, but that is as far as she's going with MOH duties.
She sends texts about potential wedding day disasters, does not ask to help with anything or even ask how progress with the wedding is going, and makes snide comments to me whenever possible.
She's also now pregnant and will be 7 months pregnant at our wedding (and made another comment about how she will try "not to steal the spotlight" with her baby bump).
What do I do? I feel like I keep getting beat up by her, she is not supportive, and while I am so appreciative that she's planning the bridal events, I feel like it's more done to check a box versus actually caring.
I don't feel comfortable with her making a MOH speech, and am just so depressed over the fact that I made her MOH, a category that I really put a lot of weight into (I know it is my own fault in that regard - I should have waited longer).