listen I get how that feels. Im also black and (used to be) a femboy, my parents threw out all the stuff I had gotten from friends or otherwise. but there's nothing you can do but keep being yourself no matter what she or anyone else says to you. I'm sorry shes like that, but if you want to keep wearing your stuff, you can give your clothes to a friend and change at school, or just find somewhere else to hide them at home.