"I didn't know when you found out though. And I was here when you first contracted - you didn't want to. You were worried about something, but there was a deadline and the zoo. It wasn't exactly purely a long, thought out, carefully decided process."

There's room to doubt, is what she means.

"If he did something to me, you'd do what we always do when someone isn't themselves anymore. Heart instead of brain is the only difference."