Agatha would have been rather quiet considering the company and stayed close to Severus. At the mention of someone involved in charitable work, she would have hesitated for a long moment then suggested Carlotta Pinkstone. She would have added that she didn't know all that much about the woman but she did know that Miss Pinkstone did do a great deal of charitable work.

She wouldn't have been entirely comfortable about dropping Carlotta into things like that (though she'd have done her best not to show that) but she's also of the opinion that a woman like Carlotta Pinkstone is more than a match for anyone in the room.