Does anyone know what movie this is?

I remember watching a movie at a sleepover when I was younger (around 95) about this red headed woman who eventually realizes that her daughter is a devil, also the daughters babysitter is a devil. They have these symbols on the palm of their hand that indicates this. The woman is pregnant and is getting help with the devil problem from a private investigator. The PI winds up getting killed in a freak accident from a construction ball or cannon ball or something which obviously the devils did. Anyway the woman gives birth to the baby and sees the mark on its hand so she knows its a devil too. The last scene is when the mother goes into the nursery with a gun to kill the baby but can't bring herself to do it and kills herself instead. Really morbid movie that gave me bad nightmares. Now that I'm an adult I want to watch the movie again but have no idea who is in it or what its called. Does this sound familiar to anyone by any chance lol? Thanks!