I don't think that she's like him, Lav, but she's agreed to go into a secure cell on this next full moon so we can see how she does. If she's tame like she says she is, then I think you'll be okay.
If Greyback arrives then we'll make sure he's put down immediately. I'll even make sure the people to go for the pods and the medical people know to look for him and to make sure he's taken down immediately if he arrives, if you like.