Ugh I’m so annoyed. Should I just stop being friends?

I have this good friend but every time we make plans she flakes. we made plans to go swimming and make dinner and literally while we are at the store buying things to make dinner she says “oh sorry my dad just asked if I wanted to come hangout and have dinner so we can only swim for like 20 minutes ”. another time she text me “hey want to come over and hangout” I said yeah and right when I was about to leave she said “actually I just remembered I have a fever so maybe next time”. Recently I was invited to a Quince and asked if she would like to go with me since the host said to invite someone. She said yes and has known for a month and was super excited to go with me. (She’s very outgoing) she texts me today “sorry I’m not going anymore”. She said because the ceremony will take to long 😩The party is in a week and I’ve already sent in the RSVP. She always hounds me about inviting her places because I attend a lot of events with very wealthy people and she wants to be included but then she just flakes.

This is also only a few examples but I’m irritated with it