Corns naturally enjoy hiding the majority of the time, Especially young ones!
My older ones enjoy laying out in the middle of their cage in open view sometimes....but these are adult corns that are used to me and surroundings now. It takes a few months for a small snake to feel more confident and not slither away into hiding all the time.
I am sure your corn is out when you are asleep. They know when you are watching. Give her a few months and you'll see her out more and more. But even then. snakes generally prefer hiding most of their time.
bmm