"Hey, like, what's going on?" came the voice of Tiffany (with the mind of Karyn, though bimboized). "Jenna?" she asked, staring at the icky Goth girl who looked like her mistress' twin.
Without a second thought, Amber darted towards her, then grabbed her, intending on making her Goth, like the rest of them. But she was puzzled when nothing seemed to happen. Normally, Tiffany/Karyn would have liked another girl embracing her, but this girl was a creepy Goth girl and she wanted to get away from her. But Amber wouldn't let go. In fact, she seemed to hold her tighter.
"How come she's not changing?" asked Zoe.
"I wish I knew," Athena said. Then, to her surprise, the stone began to glow, just as bright as her own did when it detected the use of magic. She had to look away from the bright flash, and then she suddenly knew, as the stone had inserted the information into her mind. Amber's power to change people came from a wish made by the stone, but Tiffany (who she didn't know was actually Karyn, as that information wasn't included) was also changed by the stone, turning her into a "slutty lesbian bimbo" (at the time, just like Amber ... the original Amber, who was now in Karyn's body). And since wishes couldn't be reversed by the use of another wish, Tiffany was unable to be anything other than a slutty lesbian bimbo.