Hm... I'm wondering if it would be possible to do a sort of hybrid—that is, she can choose whether or not she leaves her body, and if she does, she gets the bonus if applicable? It makes a kind of sense, since going fully into a different body seems like it would be more powerful, and it's not always going to be that much more powerful anyway because it only ever applies to first possessions.

If that's not possible, let's just do the full possession bodyhop version. If it is, though, I think she will not go for the bodyhop in this case.