wait until the class is wrapping up and ask her to do something low commitment at that point & gauge the vibes. gonna be honest, this is the singular problem lesbians - cis & trans - gripe about. no one ever takes a shot even when both parties really want it. a lot of leftist, cis lesbians are super aware of this so they intentionally take a shot and flirt when they want to, just as a vibe check. so ironically, I, a straight girl, get hit on more by cis lesbians than men - cosmic irony.