Board Thread:Episode Discussion/@comment-14138255-20161023154654/@comment-30096930-20161027035914

Sentry 616 wrote: That doesn't seem to line up with suddenly appearing on a moving train. I doubt she saw it before, but who knows?

Jumpers only need to see a picture to jump. Plus if she's secretly Sienna Khan (personal theory) she would have a reason to have been in that train before.