Who is the girl that Charlie punched

Can somebody tell me who is the young that that charlie punched meant to be?
They are all sitting round the camp fire & she says something about charlie & Jail & he punches her making her fall over.

Shes also the one at the end who chats to Linda and says she has to tell them shes gone & when they are in the desert by the fire, she slinks off in the darkness.
I always wondered who she is meant to be in the group?

And which one is squeeky? Is she the one that pts Linda's daughters hand in the fire (stupid bitch by the way)
Didnt think squeeky was that thick.