Bree - I don't think Syd could've met her as she only stayed in LA for two years and that was 4-5 years ago...
Sammie - Syd would've been one grade higher than Sammie when she came to LA. Sammie seems sporty and Syd is...er, not. Hehe. Syd would've been a little depressed then, because she left Atlanta (and Matt) and if Sammie's the type to be all cheery and hyper, she could've been the one to drag Syd around for morning jogs (which is the only "sporty" activity Syd engages in up to the present). :D