A Daughter's Nightmare (2014)

Soon after her father's death, college freshman Ariel learns that her mother Dana, has met Adam, a seemingly well-meaning, charming man at a grief-support group. He claims to be a nurse, but the longer he hangs around, the sicker and more isolated Dana becomes, even from Ariel. When Dana suddenly goes missing it's up to Ariel to discover the terrible truth of Adam's past before it is too late.