My car was booked in for a service today. I'm temporarily living with my mum (I'm 25 and pay her rent) and she lives rurally, where there is no public transport. None of my friends live near my mum. So my only way to get back home once I dropped my car off was for her to pick me up. We agreed that today would suit us both - the car was to be dropped off at 8.30am when the garage opened, then picked up again this afternoon after I'd finished work. She was aware that it needed to be dropped off at 8.30am. It takes about 25 minutes to drive to the garage, and we have heavy snow in our area so would take longer.
Last night she messaged me 'what time do you want to leave in the morning?' I replied '8am'. Whatsapp shows she read the message 2 minutes after I sent it.
This morning I admittedly wasn't ready to go until 8.10am, however at that point I went to her bedroom door to ask if she was nearly ready. She called back, slightly annoyed, that she was in the shower (ensuite). I said 'but we were supposed to leave at 8am'. She replied that she'd only seen that message this morning (which wasn't true), and that the garage wouldn't care if we were a bit later, to which I pointed out that I had to be at work. She said 'aren't you working from home?' and I said yes, but that I still have to be online by 10am. She shouted something else back, annoyed.
I then asked my younger brother if he would be able to collect me instead, but he said he wasn't confident driving in the snow. I needed the car serviced as my MOT is booked for next week so I was stuck for options. My mum appeared downstairs at 8.50am and brightly said, 'morning!' as though nothing was wrong. I expressed my annoyance with her and how she'd treated me, and she basically said I was being totally unreasonable.
We left at 8.55am, got there at 9.30am and I ended up being 10 minutes late to log back on at 10.11am. I had to text my manager while my mum was driving us back home and I was stressed about being late. At no point did my mum apologise for any of this.
AIBU to think this wasn't a good way for her to treat me? Why bother asking me what time I wanted to leave if she was going to do her own thing anyway?