Thanks wva. There's still more to be heard from the friends within the logic of the story:
Why go outside the arena if you're sick, unless to rest in the car? She probably would have told her friends where she was going, and since it it was her car, she should have had the keys. The friends would have reported checking on her by cell or at least having gone with her to the exit gate, and having kept up with her, as she was their ride (at least in some of the reports she was the car owner and driver).
If she were sick, she must have gotten better since she tried to re-enter as late as approximately 10 PM.
Did her friends establish a rendez-vous after the concert, since she called them from stranded outside and she (?) had the car?
Since she had her purse, she could have bought a scalper ticket on the cheap as the main act opened and gotten back inside or her friends could have pooled some $.
So there is more to the friends' story than we're hearing, maybe due to fuzzy reporting, friends' reluctance, or being kept unclear at LE request.
There's also a lot of time unaccounted between when she left her friends and when she was reported trying to regain entry.
A quite curious jumble of information.
Thanks for the local info.
Crypto6