I am rehabilitating two orphaned flying squirrels. They are not sibs but both are around 10-12 weeks old and are in a large cage. One of them does not want to climb the sides of the cage, or branches in the cage. If let out of the cage overnight, she is found in a ball in the corner of the room in the morning, even though the cage is open. She spends almost all of her time, evenings included, in her nesting box (yup I know they are nocturnal).

I hesitate to release her unless she shows more interesting in moving around and climbing. I'd appreciate any comments regarding her situation or any suggestions to get her ready for releasing.