My future sister in law has spent the past two years making my life as difficult as she can.
My fiance and I have been on and off for the last three years, since he's in the military and I didn't want a long-distance relationship. However, this past fall, he told me that he had to spend his life with me, and I realized I couldn't be without him, even if it was and often will be long-distance.
However, his little sister has taken our previously fluctuating status as a personal insult. After the first time we ended it, she told anyone who would listen (our friends, their parents, etc) that I am an ugly, stupid b**** who didn't deserve him. This has continued, whether or not we've been together.
Now, she's bad-mouthing my dress, calling me and my ideas tacky, refuses to be a bridesmaid (good for me, but still rude), and said "she refuses to let her brother get married in any ceremony I plan".
I'm sick of the constant hatred from this girl. She's an adult woman and should know better. My fiance has talked to her many times about this, my FMIL has talked to her, and my mother and sister are prepared to kill her and hide the body.
I have truly never been anything but polite and friendly to her. I'm a "kill them with kindness" kind of person. How can I get her to at least calm down so my wedding is as drama-free as possible?