Remote TV system for memory impaired

Hi! I’m currently looking for a solution to remotely manage a tv for my elderly mother with dementia. She has difficulty understanding the buttons on the remote and how to change channels so I was thinking of using a digital signage solution with a collection of her favorite movies/shows. Part of the issue is I live across the US from her and trying to do it over FaceTime is a nightmare. The perfect setup is a tv that automatically connects to the service via Ethernet so no physical remote for her would be needed aside from turning the tv on/off. Are there any free options available?

Thank you for your time!