A/N: So, for those of you that got confused with what happened in the last chapter, I apologize but it kinda had to happen, so I'll explain.
When Ana went to the witch to get changed back into human, the spell went wrong because the witch wasn't strong enough, so instead a doppelganger was created by accident, which Ana could alternate being either herself or her Doppelganger. And when she wasn't her Doppelganger, the Doppelganger believed that she was Ana before she was turned. When Ana was in the hospital bed with Damon, it was an act, so he'd believe she was going to forget her memory. Katherine never did forget her, but that's all I'm saying about that. When she was drunk on the phone to Damon, that was Ana in her Doppelganger, but when the truck hit her it was only then that she realised that the spell had gone wrong. Ana had been messing with Damon's head since she got hit with the car, and when she released her Doppelganger, The Doppelganger didn't have a clue who she was, because all she'd ever been was an exact duplicate of Ana before she was turned. So it was almost like Klaus and Alaric in a way, but Ana chose whether or not she wanted to be in that body or her own.
Hope that Clarified everything. But if it didn't, let me know what confused you.