User blog comment:Gourgeist/Shingeki no Kyojin Chapter 66 Review: Wish/@comment-3203692-20150212184159/@comment-424719-20150212201023

I'd hazard a guess that whatever knowledge Frieda gained had something to do with it. Perhaps keeping the Titans alive was a better choice than wiping them out? Maybe she totally subscribed to the First King's theory and wanted a world ruled by Titans. We really don't know, nothing but theories at this point. Cool to speculate though :D