Would you be upset?

So my sister was my MOH in my wedding recently. She accepted to be in my wedding last year October which is close when I just got engaged. Time flies and it’s three months before the wedding. She still has not picked out a dress yet. A month and a half
goes by and she still did not get her dress yet. I ask her why and she said she’s broke. So why not say I can’t afford to be in the wedding? So I am nice enough and by her dress. Hardly even a thank you. A week before, does not even ask me once if I need help with anything. She’s posting on social media going to the pool and dinner with her friends, cooking out and having get togethers but does not mention one single word to me? Four days before the wedding she texts my mom and says she can’t be in the wedding anymore cause she has to make money and babysit. Seriously?! I already bought her dress. Four days before my wedding and she decides to play this guilt
trip. I offered to pay for her gas to drive to the venue. She got a free hotel room. The morning of when all the girls are getting make up and hair done, she decides to get airbrush done which is way more expensive than airbrush. Then she gets her hair done. Then afterwords she comes to me saying she has no money. I had to pay for her makeup and hair!! I was so frustrated. Not even a sincere thank you. Each bridesmaid got over 5 gifts from me which she got one to and didn’t even say thank you. Before the reception I couldn’t find her anywhere. Turns out she was sitting in the room on her phone pouting. Really? She ended up leaving my wedding right after dinner and didn’t even say bye to me. I had to ask multiple people were she went and nobody knew and then someone saw her leave.... Turns out my brother ended up giving her money to go take his kids home. Interesting. I asked her if she will be paying me back. She said she would in small increments. She’s posting things again of buying and doing all these expensive things and still have not received a time or not even a thank you from her! So I asked her today. And she got all rude with me and said she won’t have any money until next Friday. Keep in mind that I have been holding a lot of tension in from her upsetting me. I finally broke down and said I really am sick of being treated like this. I told her that I feel as if she has been ungrateful for what I have done. Then she tells me she had to pull a lot of strings to be there because she has other siblings she has not seen in a long time (we are only half sisters) and that I need to calm down relax and get therapy... she then told me that I didn’t even do anything for her because I am asking her to pay me back...I am beside myself on how she treats me... who wouldn’t be upset about this?