Board Thread:General Discussion/@comment-25266931-20170206193307/@comment-26397825-20170210065804

Silver Eyes are capapble of killing Grimm. This much we know. The Dragon wasn't frozen or burnt, it was turned to stone/put in stasis. Cinder had a Grimm go inside her body when she absorbed the power from Amber by the use of the glove.

So, my theory is that the Silver Eyes tried to kill the Grimm inside Cinder, possibly by petrifying it, but Cinder's human body protected it at a cost. So Cinder's 'injuries' are due to the Grimm inside her from the glove, and may in fact have something to do with turning to stone/petrifying.