When the light was gone, Sarah looked down at herself in shock. She was in Jon's mom's body! "Ugh, I'm old!" Sarah yelled out in disgust. It was weird for her to hear Mrs. Madison's voice instead of her own.
Mrs. Madison, who was in Sarah's body, stood up. Since Sarah was whispering her wish to herself, Jon's mom didn't hear it and didn't remember the previous reality. She looked at Sarah, a little annoyed. "Sorry," she said, out of the side of her mouth and pushed past.
This was a case when Jon's "precautionary" wish came in handy. Even though he wasn't in hearing range of Sarah's unfortunate wish, his memories didn't get altered and he still remembered how things were supposed to be.
