She is, in fact, significantly smaller than he is, so it's only logical to send her scouting into the nooks and crannies his shoulders won't fit in, okay. (And also, if Ghost really thought it was dangerous, he'd never consider it. Protect kids is about the only part of interacting with kids he has confidence in.)

"Up you go."

It's not lifting her with his hands, but the lift of an energy field of some kind, like reversed gravity lifting her up to the shelf and letting her bob in place until she can pull herself onto it. Kids think flying is cool, right?