Who dun' it

Roxie Davis and her best friend Ashlynn Carson used to do everything together. But when they go out to eat for her birthday one night, Ashlynn goes to the bathroom and never shows back up. Suspicious, Roxie goes to the bathroom to look for her friend and finds her laying there, blood running through her body. Her friends thinks it happened by accident somehow but then the police show up saying it was murder. The only thing Roxie can think of now is, who could have done this to Ashlynn.