1) Does the snake have a hiding box? That is very important with Drymarchons.

2) Is she being fed enough? If they are hungry they wil do a lot of cruising and rooting in the cage. usually they will not rub there noses raw unless they are totally stressed out or its breeding season and they are sperated. Your snake does not look like it is stressed out, but more just being on the move looking for food or a hide place. Hopes this helps

Dan