Ironically, one of the reasons that Cornell is being sued for gender unfairness is that it hosts a national student group called “undergraduate women in physics” (they have one in chemistry as well, I believe), but there is no corresponding group for men.
There is a lot of support available but ime most physics departments have faculties that are more reflective of the student split, especially if you look at the seniority levels.
Imo, a terrible idea, not least b/c it is unlikely to work. Further, the closer to true something is, the more likely it is to persuade other people of it’s truth. And, frankly, if the only way she can get in is to pretend to like something she doesn’t, is that really the place for her?