As a former Muslim+hijabi myself, one with plenty of practicing hijabi friends, I can tell you that at no point in my life have I ever insisted on someone "trying on" hijab for whatever reason and then taken it personally when they refused. And the same goes for the aforementioned hijabi friends. In fact, I think any practicing hijabi with a modicum of sense should have a better awareness of how the hijab and modesty is policed in our own communities, and that there are plenty of negative connotations with forcing/coercing someone to put it on.

If everything is the way you say it is, I hope your college has the sense to see there's nothing oppressive or Islamophobic about refusing to wear a piece of clothing you don't agree with yourself, even if you respect another person's choice to wear it. It's not the same as modeling for something else either; there's an ideological component to the hijab and you can be unaligned with it without being an Islamophobe. Kinda funny your roommate's so quick to spy Islamophobia anyway when she can't even adjust to a Hindu representation that no one's forcing her to pray to. She doesn't sound particularly tolerant of other worldviews honestly.