Probably too late, but you should cancel, drive by the hotel and resturant, letting her know those are the places you had reservations for before you were too worried about her needing a night to recover from all the drinking, and cancelled.
My gf went out to the club last night. She promised me she wouldn't drink much because we had alot planned today. I told her to do whatever she wanted but she promised she would only have 1 or 2 drinks. Turns out she got kicked out for being too wasted and she couldn't even stand because she drank way too much. I told her before hand that if she was sick the next day I was cancelling plans with her. Is Valentines day a good time to break up with her?
this, for me, confirmed you should have dumped her on valentines. this bitch couldnt do a simple thing like not get sloppy, so who cares about her future mental health? i wouldnt. these things happen.