AIBU to think she made a commitment?

[SistaPB]

I’m part of a choir and sometimes we do socials. Some of us were going to an 80’s night and I asked the person organising to get me a ticket. I realised after a couple of weeks that I couldn’t go so told the organiser and asked if I could get the phone number to call for a refund. The lady organising said there was someone else who wanted to go so asked if I would sell my ticket to her. I agreed and contacted the lady who wanted to buy. She said yes and asked me how much it was. I told her and said how much it was and she said she was fine with that. I was busy for a couple of weeks but then contacted her again and sent through my bank details. At this point she did a 😬 emoji at me and said she was now double booked.

i am now too late to go back to the venue and get a refund, as I would have done if she hadn’t said she wanted the ticket. I’m now stuck with a ticket that I can’t use. AIBU to think that she made a commitment and that just because I was a bit slow in sending my bank details this doesn’t make it reasonable for her to just say “oops sorry I can’t go”!

am left feeling a bit annoyed and out of pocket!!

I suppose if you had been more prompt in following up with your bank details, it's possible she would indeed have told you sooner that she couldn't buy them. Maybe she was waiting on you to ask for the money but as you didn't, she thought it wasn't that urgent. Probably a little ownership on both sides here but that doesn't change the fact you're stuck with a ticket you can't use. Probably a lesson learned not to leave it too long if similar situations arise in future.

You didn’t send your bank details soon enough, she will have thought you’d changed your mind or sold it to someone else.

Your procrastination caused this, not her desire to fix something to do for that particular night. How hard would it have been to send your bank details as soon as you’d stopped talking?
yabu