I think it’s a good idea to keep in mind that her parents think that she can only apply to the “best” schools. @pearlescentrose does not think these are the “best” schools.
@pearlescentrose has been on the forum for a good couple of months and I’m sure she already knows that rankings and popularity aren’t good measures of a good school or a good fit school. I don’t this was the advice she were looking for.
It seems really difficult to improve your chances quickly without adding higher-accept schools. Maybe you could ask your parents why they don’t want you to apply to more schools if it isn’t financial?