I am not sure how to put this so here it goes. My FH and I got engaged in January and have set a date for next December (2021). My FH younger brother( who is the best man at our wedding) started dating a girl around the same time my FH started dating and just recently, he proposed. Before they got engaged I asked her to be a bridesmaid, knowing that she was going to eventually become my sister-in-law and I didn’t want to make her feel left out. Before they got engaged, she told me that they were looking at a spring 2022 date, to give us time to have our moment. Well, they set a date for October 2021. (side story: they asked my future-mom-in-law if it was ok for them to get married 4 weeks before us and she said yes, they did not come to us) 4 weeks before my wedding and on the same weekend as my bachelorette party(I told her the date before they decided to go with October). She is doing the same colors as us and they are going on their honeymoon(the same place that we are going) a week before our wedding. Another issue that I am having is that (this could be me just being a brat so please call me out if I am) she didn’t ask me to be in the wedding but she asked my FH little sister to be in the wedding. So everyone in his family will be in the wedding except me. She hasn't helped me with anything related to the wedding, even when it comes down to asking her opinions about colors, she won't say anything. Also, because our wedding is a month apart my FH has family in Texas and won’t be able to ours because they will be attending my future brother-in-law and future sister-in-law first and can't travel across the county twice. I guess what I am trying to get across is that I don't want her in my wedding. I want to say something along the lines of “I know you are going to have a lot on your plate with your own wedding and I feel like I don't want to add stress to your life by making you feel obligated to be my bridesmaid so if you would rather opt out I need to know now so that I can ask someone else." but I am terrified of relationships getting ruined by this, but I am to my breaking point, so I will take any help. When consulting my other bridesmaid and my mom, they agree that what she did was crossing the line and should be removed. As I said, any help would be appreciated on how to move past this.
Thank you!