She would know Alex (uncledavis) who is good friends with Zip!
And she would also know Oliver (wilkesism) who is an Auror also and a former Slytherin from the same year.
I think that's all I really have for you.. Glinda and Kasia are both younger than her and from different houses and Bree was a 66 Claw, so I think she's too old for them to have much.