Board Thread:Misc./@comment-35023329-20180323162141/@comment-28958062-20180325105117

Technicaly you could say she never left her titan form, we can consider the crystal as Annie's second transformation.

However since Annie hardered all around herself, she can't get out or trigger another transformation because she's stuck in place plus they put her underground.

This other person titan's power acts very different from the norm and could free themselvers despite being stuck in place, that's why I believe it's more realistic that Annie is still stuck in the crystal.

(even if it would be awesome if she freed herself and joined the fight)

About Eren's coordinate powers, I can't say anything else but read the manga.