Maternal Obsession (aka Her Only Child), a 2008 Canadian thriller directed by Douglas Jackson.

Lily (Nicholle Tom), 31, an average woman with an average life, is pretty, friendly, and does well at her job. But one facet of Lily's life is totally abnormal—her mother.

Moving back in with her sick mother Inez (Gwynyth Walsh), to help take care of her, she now can’t get away. Her mother is a lonely and bitter woman after her husband left years ago and she has tangled such a web of guilt and lies around Lily, that she is too scared to leave. Inez goes to all extremes to sabotage every relationship Lily tries to have.

But when Lily begins dating the guy she works with, Larry (Cameron Daddo), a seemingly perfect match, Inez knows she must pull out the big guns to ensure sure Lily and Larry never end up together…