As soon as I got engaged my younger sister told me that she was my maid of honor - if I was alright with that or not. We have never been what you would call "friends" or even friendly, but I was happy that she wanted to be in my wedding and I agreed. Things went great for the first few months of my engagement for my sister and I. Then once we picked out the bridesmaids dresses, and decided her dress would be a different color to be noticeable as MOH. Once our mother ordered her dress in the different color her attitude totally changed! She started smoking weed again (which makes her bad attitude WORSE), and just picking fights at regular. My FH and I decided that we were going to take away her MOH duties (bachelorette party). SHE FREAKED OUT ON ME. And now she doesn't want to even BE in the wedding. She told me she would rather go to work than show up to my wedding. So now we're at 4 months before the wedding, and she is doing this. I don't know what to do, or if this is just a phase?