OK, this character is a homeless woman (she wanted to be a musician but her career badly flopped and she ran out of money). She got bitten by a vampire and rescued by two superpowered kids (twins). The kids take her back to a cave, then decide to turn her into a vampire and trap her in the cave with the spell. They hold her prisoner for a couple weeks, and then lock a guy in with her and starve her until she kills him. She ends up accidentally turning him into a vampire rather than killing him, which the twins are amused by. A couple days later, they do an experiment that scrambles both prisoners' minds, and she recovers but the guy she turned doesn't. He's left severely brain injured and functioning like a toddler. How will she react when she finds out the guy didn't recover? The twins are telling her to take care of him because they don't want to bother. One thing I thought of was feeling guilty, because he considered resisting the experiment and she encouraged him not to (not all their experiments are dangerous/unpleasant, and she's afraid resisting will get them mad).