i need to vent

My 21 year old niece is my one and only bridesmaid. She gained quite a bit of weight during quarantine and our dresses went thru final alterations last March (wedding was supposed to be April 2020). I’ve been asking her for months to try on her dress. Well, she tried it on yesterday and it won’t even zipper. My wedding is in 2 weeks! She called and only found ONE local seamstress who could squeeze her in and have it completed before the wedding. She was supposed to go at 1 today and here it is, 3pm, and she’s stuck at the dealer getting an oil change. I am furious!!!! Then she proceeds to tell me she can’t go during the week bc she has to work. I told her this needs to be a priority and she said school is her first priority, not the wedding. I am trying not to lose my cool. Why are we getting an oil change instead of showing up for an emergency seamstress appt. I never said school shouldn’t be a priority but she could’ve skipped the oil change today. She can take an hour or two off work on Monday. It’s not my fault she waited til the last minute to try it on!