Yep I know plenty of kids that did this, in fact I was a tippy toe walker well into my childhood. I can still walk on the very tips of my toes (strange I know). But getting back to how Eliza walks, my gf's daughter did this for a long time, and she actually got told by a silly person that she was going to get back problems and bowed legs and blah blah blah, she was stressed to the max. Well her daughter now walks on two flat feet and she's fine. So try not to stress about it its one of the cute little quirks they only have for a short while

*hugs*
Cailin