The issue isn’t really whether or not Braasch is racist, but rather her contacting the authorities didn’t reflect racial bias. Arguing Braasch’s field of study or support of a professor of color doesn’t alter the possibility that she was simply dead wrong in her actions. Just as her having PTSD is really meaningless here — are Yale students supposed to avoid contact with other students in nearly every context because one might suffer PTSD? What about the targets of her suspicions?
I don’t think you’ve made her case at all here, not through any fault of your own, but because she really doesn’t have one to make.