Question: In the scene in the girl's locker room, after Heather Chandler's death, why does Veronica get into a shower with her clothes on?
Answer: I think it's one of those "This can't be happening, I must be dreaming" moments. Same as when a character pinches themselves in order to wake up, or they tell someone to pinch them. Veronica can hardly believe what she and JD did.
Question: Based on the ending, when Veronica invites Marsha to hang out, I have the impression that she doesn't intend to confess her involvement in the fake "suicides." People will continue to think that Heather was depressed, and Kurt and Ram were secretly gay. Is there some reason, other than jail, for her to let everyone keep believing the lies?
Answer: People who were bullied by Heather, Kurt, and Ram might feel better because of the faked suicides: they believe that the bullies were actually struggling with issues. As one boy says, he now thinks that Heather quit dating him because she was dissatisfied with her own life, not because he wasn't good enough. In the locker rooms, a girl tells Veronica that she thought Heather was just a bitch, but "guess I was wrong."
Answer: Most likely it's an act of contrition, symbolically attempting to "wash away" her sin.
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