That's ok. Maybe she can be in danger and some elemental risks her life to save her and she realizes the error of her ways. You know, the whole premise is that evil will be vanquished in the end, so I would hate it if Terran is in the side of the vanquished.
Another thing is that we would have to take another player with Earth powers because the elementals now have none.
This is just brainstorming ideas ok? Nothing is set in stone yet, except the defeat of evil at the end.