A lot of people with dementia lose the opposite, which is their ability to communicate using words. When I have a person with dementia who has aphasia (doesn’t speak or has great difficulty speaking) we “communicate” by way of gesturing and nonverbal, physical motions. I once had a resident who mimed laughing, which was funny in its own way. Maybe you can find some way to communicate with her using what you do have: physical touch and eyesight, to get your point across. Honestly, when it comes to TV, a lot of people with dementia can’t follow the storylines, anyway!