Two Modify Memories. The first one erases the first five minutes, and goes off cleanly; the last thing she can remember is deciding to work on corrigibility, which is what the note claims she started with. So far, so good.
The second one is the one that is kind of a little bit like dying. Not that she's going to dwell on that; one, she doesn't have time, and two, she's already missing half her memories of how she got here and what the plan was and if she gets distracted she'll fuck up.
Keltham would say that on any occasion where you're deleting your consciousness you should expect to wake up somewhere else, but Carissa is not persuaded by this theory of Keltham's.