Starting Fri. 8/14: My MIL (70) and I who live 5 miles apart, had plans for a day trip 2 hours away on Wed. 8/27. She was gifting me the admission as my birthday present which was the following day. I then found out my Dad wanted to drive up from my hometown, 3 hours away also on Wed, 8/27 to take us out to supper for my birthday. He still works at 83 and was going to come up after after visiting his customers on the way and get here around 4pm. The trip with MIL started at noon, involved taking a shuttle to the tour area, shuttling back and then the 2 hour drive home. Since Dad's visit made that tight to make it back in time for his arrival, I decided to look at the event website to check to see if any tickets had become available for the Sunday prior as MIL had said they were sold out. And there were 2 tickets! Since they had previously been sold out, out I snatched them up so as to not lose the spots. When I explained to MIL, she said she really wished I hadn't done that and asked about the tickets she'd already paid for. I apologized and said I would pay her back for the tickets she bought and explained about my Dad coming up and feeling anxious about the tight timing. On Fr. 8/22, she left me a vm that she was really hurt by what I did, she is going on Sunday and needs time to process her feelings. Because she said she didn't want to talk, I texted, "I apologize that my action were hurtful to you. I won't make any excuses and am ready to listen when you are ready". She replied "I need time to process my feelings on the matter. Please give me the time I need. I'm not ready to discuss it." to which I replied "Of course. That's what I was trying to say. That I'll be here when you are ready. I'm sorry id it came across otherwise" We have never had a "fight" ever before in 20 years and I'm kind of astounded. I've honestly never treated her like a "mother-in-law". We've done girls weekends away together and shopping days. I even invited her to a mother-daughter week long vacation in France. I will say that I've been more introverted the last year due to some mental health issues and have not gone on every family outing with her and hubby. It would not cross my mind to not have hubby go. I just choose to stay in when I need time to myself. That was a week ago and I haven't heard a peep since, Hubby has seen her and she hasn't mentioned anything to him and I don't want to put him in the middle. I don't want to minimize her experience and I own my mistake that I should have asked her first. Hubby and I are headed out of town on my birthday tomorrow for along weekend at the beach to celebrate our 20th anniversary. If she decides to call during that time I really will not want to deal with the drama on our trip and am afraid she'll take that as me being petty. I don't even know how to feel. I go back and forth between being sad and frustrated that it has turned into this big thing. So, AITA?