Gwen wouldn't know her, boo! Casey is in her house, albeit a year older. He might know her by name/by sight. Not massively helpful here, but random interactions as ever!
Violet is sweet to everybody, so would probably get along with Nora. Sam is a bit weary of people and Nora might intimidate him a little. But acquaintances if you'd like? Finally, Toby is in her house/year. Depending on how she treats him, he'd be a quality friend!
That was extremely condensed. As always though, I'm on AIM if you want to talk more! :D