Honestly, Jeremy was banking on his body knowing what to do too. It was possible to train someone to accept the Change when it came, it was possible to prepare them for what was coming, and he'd done so with the boys. He would do it with Rocco when the time came. He could not teach it in as little time as there was. Even if this only lasted a few more days, the mental effort it took to hold back the Change was more than he wanted to put onto someone so inexperienced.
"Whenever you're ready, we can go to the woods," he said, tone gentling. "But if your'e feeling something already, it's probably better to be ready sooner rather than later."
Letting it take her by surprise would be much worse.