I'm reading Children of the Mind right now, and when I read,
As the hovercar carried them toward Milagre, the human town, they passed near some of the dozens of starships currently in service. The work of migration didn’t take the night off. Stevedores—many of them pequeninos—were loading supplies and equipment for transport. Families were shuffling in lines to fill up whatever spaces were left in the cabins. Jane would be getting no rest tonight as she took box after box Outside and back In.
That seems to imply that Jane doesn't need Ender or young Val or Peter on the ship in order to transport it, but in Xenocide we learned that it would only work if they were there. I can't find the exact place, but it's implied here:
“Leave?” offered Miro. “You get your wish. Peter will soon be gone—Jane can pilot a ship with him aboard. No doubt the same thing will be possible with young Val.
Contradiction? Something I'm missing?