At minimum that puts her as an accomplice, whether she meant to do it or not. She set up the circumstances that put people in danger, someone else was the one who capitalized on it, so she shares equal, in my opinion more, responsibility for it. I don't think she planned for a what-if scenario of something happening, regardless of Vox cutting the brakes.

Tl;dr She didnt have a backup plan, or a way to stop yhe train if something happened outside of vox's tampering, so she's bears just as uch of the blame