Window Film Fall
A film i watched when i was younger about a girl who played violin and collected things in a box? no idea ..?
Basically all i can vaguely remember is that she collected all these things (other kids parents belongings i think) in a box and they used to put a dollar in this large jar covered in glitter, i cant remember why :S i think it was so they didnt break it im not sure .. but the girl played a violin and im pretty sure she falls for a guy :S
but nearish the end im pretty sure its at a BBQ she falls out her window or the violin does or both and the violin smashes all over the floor, sorry its vague 
Help? 
thanksss
Little Secrets (2001)
starring Evan Rachel Wood, Michael Angarano, David Gallagher, Vivica A. Fox
IMDb synopsis:
Emily Lindstrom, 14, is an aspiring concert violinist; she's spending the summer practicing for a big audition while her friends are at camp. She's also got a thriving neighborhood business: for 50 cents, she'll keep your secret. Her mother is pregnant, and her parents seem more concerned about the new baby than anything Emily cares about. A new family moves in next door. Their son, Philip, 12, becomes Emily's friend. Eventually, the weight of Emily's secrets~her own, the ones she's keeping professionally, and a secret Philip tells her~send her life temporarily crashing down.