She doesn't stop Ryoji from shaking Jack right away. Trying not to get shoved aside by the worried Pokémon distracts her from that for a moment.

"I'm not sure shaking him will do anything." But it definitely didn't seem like something a normal doctor could help with either. And she probably wasn't skilled enough at healing to even figure out what was going on. Maybe she'd try anyway... after she was sure she wouldn't get squished by Pokémon.