Confusion about Roxy's fear

First of all, I say right off the bat, I don't doubt she has this fear. I'm terrified of my mom's ventriloquist doll.
She says this started with some doll from twilight zone. Twiggy showed her the picture to see if it was the right doll. She said yes and was fine seeing it, according to him. So how does her fear of Chucky translate from that doll, which she can look at and be ok, to Chucky. I don't know if I missed the correlation? Outside of also being a doll. I'm just curious.