Unfortunattely that is not good news for you or the tree. I see that the tree is about to bloom which suggest that it thinks it is mid summer now. Good news is that identification will be easier as soon as the flowers open.
I do not have first hand experience with the species. What I would do is to keep it warm until flowering is done and direct after cool it down gradually to 5c. Once risk of frost is over, bring it gradually outdoors. If it is correctly labled that is.