@DarkChocHolic I feel you. Birthdays have always been difficult and I was delighted when the 18th one was done and dusted. Now birthdays are just a nice family dinner or outing with gifts/cake and I leave them to organise anything else with friends etc. I think you will need to ask her about her plans.
The whole paying for everything does not sound right, I agree with you that the expense has to be shared.
My DD has had a disappointment with some University work, and I just got an earful as apparently I wasn't sympathetic enough! I thought I was but it can be very hard to convey things over text. Anyway I am not pretty miffed at her so my sympathy is even lower now!!!!
x