Why She's Guilty: All of the drama is just getting started, and Hanna is smack dab in the center of it. She deletes the hotel's security footage, and she seems awfully eager to get a solid alibi for the night of Charlotte's murder. She even begs Lucas to do it for her.
Why She's Innocent: It's more likely Hanna just wants to avoid trouble again, and she's just working to cover her ass. The tragic part is that Hanna always seems to make the wrong decision under pleasure, every single time. This new crime is a testament to that.