Maybe Hogmanay isn't the humungous deal out there that it is here?
I was coming from a POV of Hogmanay being the biggest night of the year... the one night that, traditionally, even people who don't normally imbibe, will take a drink.
I was thinking something like maybe saying to her, 'look... this is what you're like when you're drunk, and we are finished dealing with it. So, enjoy your Hogmanay, cos from tomorrow, it's all going down the drain'. Then you could have enjoyed the beers that you'd looked forward to, and demonstrate that it's possible to have a drink and a celebration without turning into a maudlin, bitter, abusive fan-dan.
Too late now, of course, and you don't seem like you're regretting what you've done, so... I really hope it all works out ok.