I think she's just there drinking rather than looking for anyone. I think we need to stop looking too hard at 'why' people are in certain places and just face up to the fact that characters will be where they 'need' to be to drive the plots forward. She is there to stir up things between Robron.
Anyway Robron are at the Dingles on Christmas day as there's a spoiler vid of them in a scene there. Poor Robert looks a bit of a spare part just stood there.

