Well think of it this way. If she does say no, then all you've lost is your regret. You would be able to move on and live your life. If she says yes then Wahay!
If she doesnt remember you, then introduce yourself, and let her get to know you once more. You may not get a girlfriend but you'll probably regain a friend.
The thing is, if you dont do anything, you'll just get more agitated and upset about it. So get it over with.
If you need a nudge, then here's your nudge, *nudges Jason*. There's really no reason not to.