Yes, Putin's doing it for his own reasons. But to that kid, Putin's just a really cool celebrity she got to meet. For right now, it probably helps her. Ideally, by the time the crushing realization of how close she got to Genuine Scary hits, she'll be in remission, or over whatever she had.
Actually, she is awesome. She was only scheduled for a short trip to the hospital and ended up canceling what she had afterwards to spend more time there.
Relax, t'was in jest