Hello Caolinn! I'm Jo, and I've got 4 characters, most of whom don't have public profiles because mod things + other terrible excuses. Anyway...
Abigail and Keziah Smith are in the same Social Circle, so they know one another. They're both businesswomen, so Kiz would respect her for that and maybe even barter with her on occasion.
Lottie Quong (lottielove) is Abigail's roommate and super-duper friendly and cheerful and wants to hear all about your day and help solve your problems and braid your hair.
Cameron Ayers is a future Quidditch rival, but he's also a member of the Duelling Club so they probably already know one another from there.
Nora McLaggen is in Broom Racing and is also a pretty big fan of the girly stuff. She's got about a decade's worth of experience more than Abigail on that subject (the Vanes are vain) and probably offers her advice; not because Abigail doesn't know what she's doing, but because Nora's got a big ol' lesbian crush on her and wants to make her look as hot as possible. She's not self-aware enough at this point to understand why she's doing it, though, so she's definitely not going to hit on her or anything.