There are other paths -- you should be able to save Suzette in the magic or combat majors; and you should be able to save both Suzette and the south. There's a few ways to do this-- I'll let you explore. But let me know if you keep getting stuck!
Spoilers!
If you find out enough about Suzette's research, you'll learn how she does the spell (so ask her lots of questions in the History path & be nice). Then in future lives, you'll be able to find the spell (before she learns it!) and destroy it. Then she'll be okay (for that life), even if you later go south.
Alternatively, befriend Jo & steal the relics & take them south with you. Jo will ask Suzette to help, and this will give Suzette enough of a purpose that she won't have the same breakdown later on. Suzette loves a Cause.
Good luck!