These are not easy schools to get into. “Cast a wider net” = also apply to some higher admit schools. Like, apply to some schools that admit over 30% of applicants (as opposed to less than 10%).
There are some excellent all-girls schools that you should consider. (Not that I could convince my own kid to.)
This is especially important, since you will need a lot of FA, and most boarding schools are not need blind.
DO ask for application fee waivers.
Have you participated in NYSSMA?
Um… I think most schools would view this as community service.
It would be worth noting this on the financial aid application under “additional information”, and your mother might mention this in the parent portion of the application.
Take it earlier.