You said this way better than I did . Maybe that is why she didn't seem upset when she FT'd her mom. She was thinking she was going to get her car .Even if we suggest she thought she was being taken to her car immediately, that does not preclude her intending to go home later that morning. She may have intended to go to GC in her own car so she could leave when she pleased. She very well may have believed they were giving her a ride to her car first.