At this point it's pretty much impossible to tell who has a higher affinity for lolis, Kaoru or her sister from another dimension, Mitsuha (from "Saving 80,000 Gold Coins". Same author)
normally i'm all for creative use of powers, but the ability to make anything you want, with the sole limitation being it must be a container for a potion, is reeaaaaally broken.
I'm pretty sure the potions where her attempt at tricking the goddess into giving her a create anything power. She simply didn't realize how little the goddess cared when she asked.