Quick Enough?

When he got back to his house, Jon took Karyn the skunk out of her cage and set her on his bed. She glared at Jon. "It's only a week, Karyn. Then I'll change you back to normal." "And what if you can't? Wishes aren't reversible. Remember?" "Well, I changed myself back to normal." Karyn thought for a second. "Yeah, you're right. But I'm not sure why." "Who cares? I'm back to being myself again. That's all that matters." As Jon was talking, Karyn noticed the wishing stone sitting on the bed. One quick move and she could get it. And since she could talk, she could make a wish. But would she be quick *enough*?