My moms a ghost

Emily is 14 years old living with her dad and her dads girlfriend Amber. She is trying to figure out why her mom hasn't been calling anymore, but then one night she sees her mothers ghost and she claims that Amber has murdered her so now Emily needs to find out if it is true or not. She needs lot of evidence but its not going to be easy, cause there is something about Amber that isn't right and she needs to find out what before its too late.