Undergraduate university reputation is such an insignificant factor in medical school admission that its generally not worth the trouble.
Caveat: if she were transferring from Podunk U with a poor reputation for education to a Top Ten university AND were able to maintain the same gpa, etc., then it might be worth it. Trouble is, most students aren't in this situation and again, school reputation is MUCH less important in the grand scheme of things than grades, MCAT scores, ECs, LORs (if she transfers she will have little time to get to know the profs at her new school), etc.
She's young, uninformed and allowed to have some "crazy" schemes. She will soon learn that schemes don't work; the old tried and true generally does: grades, good letters and scores, community involvement, and the like.