Board Thread:General Discussion/@comment-6905051-20131203105732/@comment-4839682-20140917222606

Is it necessary for her to have remembered Emma and who she was?

Emma was an outsider, someone who did not belong and, further, she was interfering with Henry. That's enough to make Regina crazy right there.

Plus, there is the likely possibility that Regina knew Snow's child was named Emma, and would of course be freaked out even more about a woman named Emma being in town.