No they couldn't pin where it was broken, not without having external ones. It was splinted and had a cast on for three weeks but didn't heal, although the muscle and tissue did heal. So my vet consulted with a specialist exotic vet and we have taken the cast off for three weeks to see if her using it a little stimulates it to heal. She's using it a little more each day which I hope is a good thing. I'm taking her back on the 7th September for a final check. If it hasn't healed by then it will have to be amputated, but I'm feeling positive for the moment. She's in a one level cage and I feel so sorry for her without her family. Although I've put the cages together and they rub noses with her.
I know exactly how you feel, it made me sick to think she could loose her leg because of me. Good luck to both of our chinnies!