Welcome! I'm Melissa... I created a handy dandy character cheat sheet for myself here (instead of breaking your comments with it:D)
Laurie and Sofia will obviously need to know each other somehow, even if things are a bit different from canon:D And Alison and Sofia are roommates so I apologize in advance for Ali's behavior. It's awful, she's a horrible person, and Kitty, Laurie, and Tabby all say Sofia visit for sleepovers if Ali gets to be too much.