So, I had no idea that Lazy Town was actually a book first and foremost and then a stage play, in which an adult actress portrayed Stephanie. The sequel play's portrayal of her also seems to be an adult. This is moot anyway because yeah, the original story was a book that obviously has no actors at all.
This changes my perspective on the character being drawn entirely. It's pretty important context that I was missing and I apologize for that.
I can indeed be wrong sometimes. Crazy.