What was she like before she got into med school. Did she always fight dirty and say mean things? Med school is very stressful. Her emotional state will only get worse while she does her internship and residency. It will be as hard on you as it is on her.

She can contain her applications for her training after school to one area where you can get a place to live and you can keep a job. Unless she wants some very elite speciality she does not have to hop all over the country to complete her education. I think both of you need to start thinking about "us" and not so much about "her".

If she had to would she choose staying with you or breaaking up if needed to furthere her education? The answer to that questions should tell you how she feels.