From what it sounds she is being quite irresponsible towards you, her school and job. At the same time it's understandable the feeling she has, she just feels the need to do something drastic like that to make herself feel better, I've felt it before, and it's hard to decide between what's the intelligent thing to do and what you want to do. If going back really means that much to her, there's really no way you persuade her otherwise.

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Heil Frasbee