Am I overthinking?

UPDATE: spoke to her and she has she doesn’t really think she should be in it because she’s she’s scared to have an anxiety attack.

I (F28) am getting married in early September. I asked my cousin (F24) to be a bridesmaid when I started planning. We were never super close until recently so I thought it would be nice to have her stand in the wedding since we started bonding as adults. She has bailed on plans the day of a few times due to social anxiety. For example, we had tickets to go to a concert to see our favorite singer and the day of she canceled. When we planned my bachelorette trip she was down to go and once we all started planning and buy plane tickets she backed out “due to money issues” but her mom (my dads sister) called and said that she was having anxiety about going. *side note: I do 100% understand that anxiety is a real thing and I’m not down playing that. I suffer from it myself as it does run in our family* I sent out bridal shower invites 2 months ago and I never got a RSVP from her so I called and she told me she wasn’t able to because of work. (She lives with my aunt and she started her own dog walking business) and I’m annoyed because she had more than enough time to schedule her walking around that and that the shower is in 3 days so I don’t think she was planning on telling me that she wasn’t coming. (Her mom isn’t coming either because of a trip) I asked my cousin if she brought her dress yet and she told me “I think so but I never got a confirmation email”.

My worry is that she is going to back out of the wedding last minute and if she does that I will put a wedge in our relationship.

What should I do? Am I stressing over nothing?