User blog comment:Ktrfgfg/Chapter 53 Predictions + Volume12Special/@comment-64.237.230.127-20131227191110/@comment-173.65.32.100-20140106010942

Because she doesn't want to be interrogated and tortured for information. Also, I recall Armin telling Bertolt and Reiner that she was already being interrogated and tortured. So I believe she is no longer in her crystal.