[souffle]

I'm not experienced with chinese Hana but I don't think this is uncommon behavior. She is still relatively new and may still be quite unsure. We have had hamsters who have just sat in their balls like that and I would maybe not use the ball for now until she is hand tame which will like take a lot longer with a little skittish hammie. I am sure she will soon start to gain confidence and relax with you. The freezing is a reflex to protect them from predators. Ours often do it and we always say 'Oh he's spotted and eagle!' Good luck and hope she settles soon.