If you feel this is going to be long term then I would gently approach the subject with your daughter again. I feel a year is a long time, enough to know if you want it to be long term and enough time for your daughter to at least get used to the idea.
I do think the longer its left the harder it may become, which is something you could discuss with your daughter, like maybe it will be best for everyone to get the first nerve wracking meeting out of the way!
I can also understand your girlfriend wishing for things to move along after a year. I would meet on neutral ground (much like you would introduce new cats to each other! lol) chose a fun activity or outing that you know they both will enjoy enough to take the edge off the nerves.
Good luck