I think the “right kind” of role model is someone who’s “weathered the same storm, and come out of it satisfactorily. I would imagine they’re more likely to be empathetic to your plight and not judgemental.
I don’t know why the previous role models ceased supporting you. That information was omitted from your post.
Maybe you could expand the realm of what’s accepted by coming up with creative options.
How about a weekend shabbaton at a girls camp (shira, chedva, sternberg), with a kumsitz, sports for the day…. With shiurim on Shabbos. Perhaps your school would consider that?
How about a fundraiser??? Big words to a struggling school. Try to come up with fun creative ideas to help the school make money ( A bake-a-thon, concert/show, Chinese auction, carnivals).
Have you spoken with the other girls in your class about this feeling of being constrained (meaning, if they’re feeling the same way)? There’s power in numbers. I think you’re best off approaching the administration as a group and not as an individual.