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Hi, this is Dr. Gabby.
NO, it can not hurt her unless she became obsessed and stopped eating or using the litter box.
I suspect she saw something on the tv that peaked her interest. She may now be watching for it to return. Or she may have just decided she likes to watch the images on the screen.
If you do an internet search " dvd or videos for cats to watch" a number of choices come up. You could see if she likes to watch a fish tank or birds.
I leave my tv on animal planet channel on for my pets when I leave the house. That may be more to make me feel better about leaving them but when I am home they watch the screen occasionally.
Does that help? Do you have any additional questions for me?