I'm not an expert in getting drunk, or recovering from break-up,
but I seriously think that all getting drunk will achieve is to
give her a hammering headache. I think that what she needs now is
to engage in activities to get her mind off the guy. Maybe you can
bring her to movies, or arcade games, or even the Science Centre -
things that will make her think, occupy her mind, so that she does
not think about him. Additionally, you can encourage or bring her
for swimming, jogging, cycling, etc. I think it's a wonder what
some exerciese will do : give her a high, as well as help her sleep
more soundly at night.
Maybe you can work out bringing her to the Science Centre in the
morning, and then cycling in the afternoon. Next time, bring her to
the arcade game and after that swimming, or something like
that.
Personally, I thot that she would want someone to talk it over
with, to listen to her gripes, heartaches, etc. However, since this
does not seem to be the case, I therefore suggested Plan B
above.