I decided the same thing with Nevara, she was just the odd ball in that batch. We had another Sultan who was the same age with no issues, so I figured it was just her. She eventually grew out of it, so it wasn't a big concern. I suspect your girl will be similar.
Your story reminds me of one of our girls when she was younger. I have to ask, when your pullet does the hopping, does she move forward, and does she fly normally? In the last batch of chicks that we ordered we got a White Sultan, Nevara, who seemed to struggle to figure out flying. When the...