It could have been that Ellie chose to be used for the cure and she knew that she was going to die. They never showed what happened before Joel went after her in the hospital. It could have been a test she did when she asked him at the end to see if he would lie to her.
As much as I want a sequel, I just don't see how it could possible live up to the story of the first one. I think they should just leave it at where it ended and go with another story of someone else. If they do another Ellie story and mess it up I will not forgive them lol.







