I think this has been very productive, last night and today...these new theories. I feel we are honing in more on what her paths may have been and why or when.
For instance, I now think it is highly likely she may have very well been still near her abandoned car when she called for a cab. She may not have wanted to go home after the wreck, at first, and this could be why she wanted the cabbie to meet her at AM/PM.
In considering this, taking into account the 911 call at 3:44, she would have been driving for at least another 5 or 10 minutes before she found a place to stop. She probably didn't get out immediately. She may have been very scared and sat there wondering what to do, providing she was alone and no one had come along to help her. She might have gotten out of her car and inspected the damage and tires. This could have easily taken another 10 or 15 minutes, depending on how frightened she might have been and what she was doing.
So that would put her at calling the boyfriend at 4:10 to 4:17 11 times and trying to reach him to come and help her or tell her what to do.
Then after she couldn't get in touch with him, frustrated as hell, she called the cab company to meet her at AMPM.
But she changed her mind and decided to walk home. She was distraught that he hadn't answered her calls. Also, she was carrying a huge bag and she wanted to change clothes.
She then sent the b/f a text at 4:47 saying she was coming over. (It was 4:47 wasn't it?)
Makes sense to me......
ETA: Yes! This makes so much more sense to me. I couldn't for the life of me figure out why she wouldn't want the cab to pick her up at her apartment and why she wanted to walk to the AMPM instead. It makes a lot of sense she might have not even planned to back to the apartment and didn't want the cab to meet her at the wreck and know about the accident.
But then she changed her mind and went to the apartment. 2Hip can map this out for us.
ETAA: all just my speculation naturally.