Joy looked at Karyn and noticed that, while she had large breasts and long blond hair, she didn't really look all that much like Sarah. Joy didn't remember anything of the reality before Karyn became Sarah's sister. This Karyn was the one that existed just before she wished herself to be Sarah's twin sister. She was genetically the same Karyn that existed before Jon zapped her with the dream machine, but this version of her idolized Sarah McMillan.
"Hey, you're not the Karyn I remember," Sarah said, suddenly realizing that Karyn didn't look like her twin anymore. In fact, they didn't even look like they belonged to the same family.
"Please help us," Joy muttered as loudly as she could. "Sarah wished we couldn't move."
"What's going on? I was just in my bedroom with that weird stone thing," Karyn said.
"I want my sister back!" Sarah yelled, running towards Karyn, intending on getting the stone back.