If she usually picked up her shared car the night before from her mom's house, wouldn't her car have been in the driveway during her first night alone in the house? I'm not sure whether that was reported...or that she normally picked it up the next morning.
She shared a car with her brother and he dropped her off at 5:30. She left for her run at 7:30. I think this is critical information, though, because my strong sense is that she was taken during travel between her BF's and her mother's home. When this happened, I'm not sure. Either she went straight to her mom's after her run, or she decided to stay at BF's and do homework, and went to her mom's in the morning.