Astoria would probably only know of her through Pureblood social circles... but she is friendly and not at all a bad sort. *facepalm* I was writing Gemma's bit when I remembered that duh! Astoria works at WWN as a writer's/research assistant, so there'd be that too... except Astoria works on Babblewyck Park. ...and there's a future plot at some point involving Astoria having to fill in for one of the actresses on account of being the only person who actually knows the lines.
Draco is disappointed to still be the bb cousin.
Gemma on the other hand, is also a fellow Hufflepuff and Chaser, though three years younger - but since Gemma started playing for the house team in her 2nd year they definitely would've been on the team together for a bit. There's also the recent 'whatever it is' friendshipthing between her and Regulus... so there's that too.