Board Thread:General Discussion/@comment-25926288-20150504001750/@comment-1894786-20150504172841

WorldHopper22 wrote: So Cora left for the Enchanted Forest after Ana became the Red Queen because she told Will that love is weakness, and she said she was wrong in Mother. Also, Cora never says that love is weakness in the present day. She said it to Emma when she tried to rip out her heart. But who knows? Something could've happened between Mother and Queen of Hearts (past) or Pilot and Queen of Hearts (present) to make Cora seem to revert back into Love Is Weakness.

And this is definitely just before To Catch A Thief. She had Percy (the White Rabbit) in her posession, and Will steals him for Alice in the forementioned episode. Since Will is already in Cora's employ at this point, you're right. It's after Heart Of The Matter. Maybe by a few years.