None of the answers really seem spot-on.
It may be that she figures it was a one time bit of experimenting when drunk, and figures you're a nice enough guy to accept the one-time nature and not retroactively turn the decision into a mistake by making her life difficult or hazarding her reputation. It may be that you're part of Control Group B [xkcd.com]. It may be that she's a LUG now past graduation. It may be that you're good enough with your hands and tongue to have a lesbian consider making exceptions.
...probably not the last. Sorry.
You won't know what's going on in her head without asking. (And if she's conflicted, that won't give a conclusive answer.) It's not impossible she's contemplating how experimentation includes a repeatability component, but don't get your hopes too high. A one-time thing seems most likely.
But if she turns you down, don't forget to ask about when you try to pick up other girls, whether you're allowed to claim to be talented enough to make lesbians reconsider.