GF and her family's visit

Quick backstory...I'm Divorced and share custody with my ex of a wonderful 7 year old daughter....My girlfriend and I have been together nearly 2 years and just had a baby boy together. Recently, my friends invited all of us to a house party on a Sat. night, kids included. GF was for it but then realized her brother and his wife were coming in to town that weekend to visit (not bringing their kids). At first we thought of inviting brother and wife to party (they are more than welcome) but GF decided she didn't want to subject them to the long drive (about an hour) to go to a party where they would only know us.

I suggested that my 7 year old and I go to the party just the 2 of us...My reasons were as follows:
1) D hadn't seen friend's kids in a while, would be nice to visit
2) I hadn't seen freinds in a while, would be nice to visit
3) My D has been wonderful with her new half-brother, but she is extremely energetic and can wear the GF out at times. so I thought it would also be a nice break for GF.
4) GF could visit with her brother and sister in law with the new baby without having 7 year old continually vying for everyone's attention. Again, 7 year old is super sweet and loving but does always want to be "around" and be part of what's going on.

in short, GF was not happy with me...said my idea "was weird" and that her brother and sister in law were coming to visit me and my D as well as new baby...

My GF and I are new to being parents together and also parenting to my 7 year old D 50% of the time. There is a lot of new dynamics for all of and I'm still trying to figure out how to make it amenable to all...thoughts?

Thanks

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