Definitely nothing to worry about as long as she is eating, shedding and pooping along with the rest of your snakes.
I have 8 ball pythons, and one of them is the exact same kind of weirdo. We tried him with several different hides when we first got him, and he ignored them all, sleeping with a small part of his body inside the hide, lying on top of it, or on the other side of the tank completely. So we took out the hide, and gave him some extra foliage. He loves it! He's also my very best eater out of the 8.
Here is a picture I snapped of him this morning. This is where he usually sleeps.
He did seem just as happy with no foliage at all, just sleeping totally out in the open, too - but I think it looks nicer this way.