Re: ooc
Astoria would have been more than happy to talk with Isabella! She'd have said thank you to the congrats and worked to get to know her as well as thanking her for coming and making sure she was having a good time.
Astoria would have happily greeted Autumn, thanked her, made sure she was having a good time and gotten her food and drink if she wanted. She'd mingle with Autumn some, too.
And Astoria would have also said hello to Fleur! Made sure she was having a good time, etc., but if she caught on that she wasn't in a mingling mood, she wouldn't have pressed matters by any means. Just been friendly, made sure she was good with food, drink, etc., and let her be.