Is she has been around for a year and it seems everyone else likes her, then maybe she isn't all bad (other than her being slightly obnoxious drunk).
I have had situations like this in the past that someone in my circle of friends rubbed me the wrong way but it was just because I hadn't gotten to know them.
Extend the olive branch and try to get to know her (before she gets drunk), then you can at least say you gave her a chance
and if you still don't like her than ignore ignore ignore in the future.