Biggest Piece of Evidence: Mona tells Spencer she still has nightmares, so it's clear she's still very much affected by what Charlotte did. And that's the thing: Mona hasn't always had an easy time forgiving.
The Point of Contention: Mona really does seem to be working toward recovery — like she wants to leave her past in her past. Plus, in the court scene, it really seems like Mona feels for Charlotte.