Did they manage to extract any information from Annie Leonhart after she was captured? She was grounded and held underground deep inside the walls, but what about it?
Did they manage to extract any information from her? If no then why? Getting by without saying a word is too good for her!
As far as the story goes, they were not able to abstract any information from Annie yet, because she had covered her whole body in a particularly hard crystal.

This happened back in chapter 34, but was the last we have heard and seen from Annie.