Who is the murderer?

Annie and Darla work at the same front desk of a B&B. On the night of the senior graduation party in their last life, Darla mistakenly checked-in a room, which led to the suicide of a high school student after she was raped by a beggar. However, Darla put the blame on Annie and falsely accused her of checking-in the wrong room. Annie thus became a scapegoat and was hacked to death with a knife by the girl's grief-stricken father. Before she died, Annie realized that Darla had been secretly colluding with her husband, and she died with hatred in her heart. After her death, Annie realizes that she has traveled back to the night Darla mistakenly checked-in the room, and she decides not to let the tragedy of the girl's death in her previous life play out again, and at the same time, she makes her evil girlfriend and cheating husband pay for their blood.