The In Crowd (2000)

Adrien Williams has spent time at a psychiatric hospital, learning to come to terms with a troubled past and is looking for a quiet, anonymous life as she begins to re-enter society. Adrien enters the 'in crowd' when she takes a job at a posh country club and falls in with a clique of wealthy college kids where she's taken under the wing of the clique's twisted leader, who harbors some dark secrets too terrifying to tell.