I caught part of a movie on TV when I was a teenager. There was a little girl with a doll playing in a river. Soon, she becomes deathly ill and has to go to the hospital. Some time later they let her out, only she's pretty much in a catatonic state, and only days later she dies. Her mother finds her body in her bed and begins screaming and crying. It was at this point I changed the channel, greatly disturbed by what I'd just seen. I never forgot it, though I didn't know what the movie was. I tried to find it today, and although I discovered what it was, I couldn't find it to watch online. It's called Incident at Dark River: A Father's Revenge (1989). I tried to find it on youtube, but all I could find was the trailer. There's another movie called A Father's Revenge, from 1988, but it's not the same movie.
Here's the trailer for Incident at Dark River: