Please help find 80s TV Movie Title?

Oditi Journo

New member
I'm hoping someone remembers this TV movie - I saw it years ago when I was little. A mother has 3 kids? and tries to kill them. She blames it on someone else when the police find the bodies,1 child survives but is in a coma. When it hears the mothers voice the heart monitoring machine beeps really fast and the detective figures out it the mother was the killer all along.
Thank you for any help
 
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