Hun, good for you standing up for yourself, I really hope it all works out for u, one option is to contact the ACLU, they have so much info for issues like this
what I do is get the 4t-5t pull ups (they have to be pull up brand or this dosn't work) tear the tabs off the back end of one (the new pull ups have the velcro on the tabs u want the side that has the velcro on it) with that u can add that in where the tabs on the others come together and make them fit better