Season 2 Theory

So it goes like this: You know how Ellie doesn't have her backpack by the end of season 1? Where is it? It's at the hospital. How does Abby find Joel's whereabouts? Because they have Ellie's backpack, and something in there gives away the location. Now this is a long shot, but, in the latest Season 2 trailer, Ellie is seen running in to a building with Dina, in what presumably is Seattle, but has her flashlight from season 1 - how is this possible?

Unless she's super fond in finding the exact same flashlight, there's no way she'd have that again. I think because she gets it somehow if Abby takes it along for the journey to get Joel.

Or, Ellie retrieves it from the hospital because it's still there, once she goes back to see and explore for herself what Joel did there in Salt Lake City at the hospital (cancelling out the Abby finding the backpack narrative).

Also, reason for the new backpack is because the old is too damaged. Thoughts?