The Killing Pact.

Hayley Udall tries to make ends meet for herself and her 14 year-old daughter while providing alimony for a horrible ex-husband. She wishes her problems with her ex could go away, and upon venting her frustrations one night, finds herself tangled up in a pact with two people (Melanie and Kevin) to "eliminate" each other's problems. It seemed innocent wishful thinking before, but as people end up dead-including Hayley's ex-husband-Hayley is trapped to fulfill the pact or risk taking the fall for murder.