One theory:
1. She wanted the BMW and assumed she could convince him to give it to her/sell it to her for a fraction of it's value.
2. Much to her amazement, TA didn't agree to that. He needed every last dollar he could get from selling it.
3. She didn't need her mother to come out and help her pack up a few boxes of books and art supplies. She asked her mother to come out thinking she'd be driving the BMW and her mother could schlepp her stuff by driving the UHaul. (her mother bought a one way ticket?).
4. Her mother was there, TA hadn't agreed to sell the BMW, her mother's "negativity" had to do with the fact she'd flown out for nothing.
5. JA discards her mother at the airport first thing in the AM on Saturday. She's psyched to go to the special pizza place TA said he might take her to for lunch that day.
6. She prompts TA several times in the AM, indirectly--- hey..I'm here. Pizza place? He doesn't reply, and if she's reading his texts she knows one reason why. He's still planning a huge party for that night she's not invited to, and he's texting Mimi multiple times to see if she will come.
7. The 2:01 text about sweet tires for 'YOUR" car is after lunchtime. And it makes zero sense because Travis has brand new tires on the BMW which he bought in December to replace the ones she'd slashed. (Taunting him about the slashed tires before she goes off to blow up his car?)
8. IMO she went to UHaul and blew up his BMW on purpose out of rage, for many things, but the most immediate being (from her twisted POV) that she'd sent her mother home so she could have a special pizza date with Travis, and he'd stood her up. Because he was planning a party she wasn't invited to, and whee!! if she was reading his texts and knew he was trying to get Mimi to be there.
9. I think she got a ride to the Pappa Johns pizza place and told Travis she needed him to pick her up from there--unsubtle hint about being stood up for that special pizza place lunch.
10. Looks like Travis did try to hold UHaul accountable, and when by mid-April he couldn't, agreed to sell her the car in part because he couldn't afford to fix it and sell it otherwise anyway.