Maid of Honor troubles

So, my maid of honor lives pretty far away from me. She lives in Denver while I live in Cincinnati. During the planning process, she hasn't been able to be here for things which is totally understandable because she's in Denver and flights are waaay too expensive. I'd much rather send her pictures of flowers or facetime during my dress shopping so that she can be there. The one thing that really worries me is the things we actually plan. My bachelorette party was suppose to be this weekend coming up and I had to cancel it because she wasn't going to be able to make it. We had a hard time coming up with a location and we finally just decided to stay in Cincy.. I asked her if that was okay and she said yes. Then she told me a week or two later that the flights were $300.. which I then said I would pay half of her flight because I know money is tight and that I would match what she had saved for her flights. She said ok thank you. My bridesmaids were trying to ask her what was going on for this weekend. Nothing. Crickets. I texted her asking her if she would talk to them about it soon. She said she was at work and was pretty busy and would get back to them that day. She didn't get back to them that day... I texted her again and asked if she would be able to make it and if everything was ok and if I could help with anything. Nothing. I then cancelled my bachelorette party a couple days later since she didn't say anything to me (😔) and told everyone.. and that's when my MOH finally texts me back saying that it was too expensive and that it wasn't worth spending $300 to only stay here for 2 nights which really hurt because I haven't seen her in a while.. So, I know what everyone's thinking, the only job she has is to show up to the wedding and stand beside me. Yes I know. I'm not a bridezilla haha but she offered to plan it and didn't follow through and kinda messed up some work schedules for my friends and wasn't going to tell us about it probably until the day before she was suppose to be here. I offered to pay for half and even her entire flight and she said she didn't want me to do that because she hates asking for help... But I did offer. I really wanted her to be here so I tried everything I could. When I talked to her about why she didn't bring this up before, she was very rude and acted like this was my fault. I'm a very understanding person. I've been stupid broke and not had a lot of money for things. I understand not wanting to receive help and such too but this is a really big day for me and we've always talked about our weddings in middle/high school... I just thought maybe this once she would take my help and be here for me during this special time. She's my bestfriend and I would gladly do that for her..
But
The past few days when I actually try to talk to her about this situation, she hasn't been saying much for hours on end until really late at night and then we can't even continue the conversation.. Yes she's at work and she can be busy at times but she's all over social media while she's at work and was completely ignoring me. I may sound super annoying but I just want to figure this situation out because flights are still going to be $300 during the time of my wedding and I need to know if she's going to be there.. not having my MOH at my wedding would be devastating and she hasn't really convinced me that she'll be there. Especially with the way she's acting towards me right now.. So my question is, should I demote her and have one of my other bridesmaids be my maid of honor or should I take her out of the wedding and find another bridesmaid? I've done EVERYTHING I possibly could. Called her, texted her about my side and wanting to hear her side, offering to pay her entire flight to Cincy to be here for me, my mother offering to pay for the hotel rooms, everything. At this point she seems like she has checked out and doesn't want to be here anymore. I don't want to lose her as a friend but at the same time, I can't just have her not show up to my wedding after I offered to help so many times and break my heart before I get married...

I appreciate the help ❤