Sororal concern

"Are you sure?" asked Jo. "I wish I knew what was wrong with you." Jo thought she had always been close to her sister Jen. So close that she felt as if they were halves of one person. But now ... "Oh ..." Jo felt information flood her brain. Unable to handle both the input of her senses and the stone at the same time, she shut her eyes. Time rewound inside her mind -- back to the point when Jennifer Hutchinson took over her sister. "No!" Fear opened her eyes. "Jen ..."