Fred/Helena and whoever else is good people!
Ginny had been making her rounds and saying hello to everyone. Sh had a big family and wanted to make sure everyone felt welcomed. After turning away from Tonks, Ginny spotted Fred and a girl she could only assume was Helena.
Well if her brothers hadn't wanted her to be so devious they shouldn't have taught her so well.
Ginny bounced over, carrying a bottle of beer. "WELL. Hi there. You must be Helena. Welcome to the family, dear."