I think IANBU, but reckon I should get a balanced answer.
This is just the most recent thing, but she's done similar in the past.
It's my DHs birthday next week. At the end of last month I invited a load of people out for a meal with us. Not a big birthday, so I didn't chase everyone. Some people said yes, some people no.
My friend said no as she might be doing something with her boyfriend, fair enough, I booked the restarent for the rest of us. Didn't bother asking her again, although I did mention it to her boyfriend, he was noncommital and didnt say they wanted to come.
Today I get a text saying "we are in for DHs thing after all."
I texted back that we were actually out in and would she like me to see if I could extend the booking for the meal.
I get back a text saying "if you are going to be funny with me we won't make the effort"
WTF?!
She does this a lot - won't commit to things, is late, and then expects the rest of us to organise everything around her. Get's pissy if arrangements change, even if she said she didn't want to come to the original event. Anytime she is invited to anything she says "maybe" and then only says yes at the last minute - normally meaning running around for the rest of us (me) who is the organising one in our group of friends.
I reckon she is annoyed because I said "if they could extend the booking" implying I hand't booked for her or included her, despite her saying no originally.
BTW - I tried to call her and she wouldn't pick her phone up. I've not changed the restaurent booking to add her in (it's a popular one, doubt they would anyway)
And breathe.