That's from Melty Lancer, and the reason there's no after shot is because that's all they show, you don't get to see her grown up afterwards. The next time we see her, she's a kid again. In episode 2, she accidently uses the wand again to grow up, and then uses her new body to get past a couple of guards, but they don't show her changing the second time, just a flash of light as she falls behind a wall. I actually prefer my version of the clip which I posted months ago with a cooler sound effect for the scene, at least I think it sounds better.
