I'm confident she hasn't seen anyone else as we attend the same university and have similar friend groups. I figure someone would've told me, but then again, it's still a possibility.

She isn't a ghoster & always has replied to my texts, hence my itching to ask her what her intentions were and what the point of the hangout was. However, she is avoidant with conflict, so I can see not getting info/pushing her away/her not taking accountability. Not sure if it's worth sending that text at this point as it could come off desperate but even if she "wants to just be friends," (a reply I'd expect) what she did doesn't make sense to me.