So judging from the epilogue and the credits, Lizzy feels so guilty about Doll's death that she's treating her corpse like Doll treated her parents', with the additional element of taking it to school with her every day and putting it in Doll's old desk. As a ghost, how's your read of Doll feeling about Lizzy and her tormented conscience?
I don't think Lizzy feels guilty about Doll's death. I mean, yes, the corpse that was shown at the back of the classroom looks like Doll's, but literally the next frame they show her lying in the cathedral. Plus, she didn't look sad or regretful during the memorial presentation (???) in the credits. I always thought that Lizzy is that type of person who befriend someone because of their power and influence, like it happened to V, because, you know, befriend killing machine sounds kinda cool.
As for Doll... they barely interacted after the prom and Lizzy's betrayal, because her thirst for revenge to V was much stronger than feelings to Lizzy. And I think that she, in the form of a ghost, will first take revenge on V, and then deal with Lizzy.
I like Lizzy, but it's mostly because of the fans and fandom. She doesn't have a strong personality in the series, she just... doesn't give a shit about everything around her? And spends almost all of her free time in the phone