Well maybe, but it's hard to tell because those two screenshots have such different lighting and poses. Here is a pair of stills from different points in those two parties, with a more comparable pose... they look suspiciously similar to me.
ph2004-12-06 at 00:21:
ph2005-07-25 at 24:56:
I think she's a plant from multiple parties... the same as this snap from ph2004-12-20 at 11:57?
If so, does anybody know her screen name or anything else she's appeared in?