@notarobot124 If she doesn’t have a plan at this point, she probably won’t be doing anything in the 6 months after school and before applications are turned in to get her into Brown. Very few people get in anyway, taking a gap year for a second chance at a lottery (and probably just a second rejection, unless there’s something impressive in the next 6 months) is a ridiculous choice.
Applying to a better-fitting list of colleges is a different story. But honestly it seems like the OP’s concerns are a bit disproportionate to the problems, and I would guess stem largely from excess focus on the dream school.