Have you confirmed that UCF will retain her guaranteed seat even if she applies to other colleges?
What are the driving factors for applying out? Is it to contain cost or want to do MD in higher ranked schools?
I assume, it is ranking since UCF is very cost effective. The only the other 2 schools UF, USF are higher ranked and will cost similar, worth applying. Miami also higher ranked but will cost more.
But if you are keen on T20, the chances are low. No harm to try if willing to put the efforts and not to regret for not tried. But just because of done some internship in Stanford or even done UG in Stanford does not imply the chances are high at Stanford MD.