Need to vent

Opinions welcomed but I am so stressed! With a year to go it feels like things are falling apart before I even really get the ball rolling. Between in-laws who are no where near supportive to now bridesmaids making me question if I made the correct choice asking them to be a part of my wedding I have no idea what to do. Honestly me and my fiancé are questioning if we should Just elope and be done with it. So with the bridesmaids here’s the issue I have one bridesmaids in particular who has been incredibly flaky not just with wedding things but in general we’ve only been friends for a year and a half but mainly internet friends because she never wants to hangout. When I went wedding dress shopping I asked her to come be you may she lives 10 minutes away had a months heads up. She said yes then last second tried to convince me to go to a different bridal shop because she didn’t like mine that right there already allowed me because I was feeling like I was working on her time. I ignored it and brushed it off told her no my deposit is at this place. She ended up not coming. Many times were suppose To hangout she’s flaked. So our engagement party was suppose to be the 28th of this month this was the only thing I asked my bridesmaids to come to an voiced it was important to me. Because I wanted them to all meet. Well we Ended up last second changing the whole date because a few bridesmaids couldn’t mate it so we changed everything around to accommodate them to get everyone here including her. Last second she pretended she was super sick. The day of the engagement party Friday she went to doctors they told her it was mild allergies. I said ok I’ll see you at 6 then she ended up go figure flaking again saying she has to “much phlegm” 😐 needless to say all of my bridesmaids were here but her and they are saying I should tell her to step down esp because I voiced to everyone how important this was and I wanted them here. This was the only thing I wanted they could cancel any other events we have I just wanted this one day for friends too meet and bond. She hasn’t even apologized to me for flaking again. It’s hard for me to have a voice and stand up for myself so I don’t know what to do. 😞 I honestly don’t think I want her in my wedding party and I know it will end our friendship but if I can’t rely on her now even just as a friend I feel she’ll even flake at the wedding.