Board Thread:Show-Related Questions and Answers/@comment-5989182-20141013155935/@comment-5834856-20141016140524

696779 wrote: Since Regina is under a breakdown this is no surprising ; Plus it's Snow White 's curse now so she 's in charge

A deleted scene from Rocky Road explains this.

https://www.youtube.com/watch?v=C_i4261OjGM

The first curse was eneacted by Regina. She became mayor. Snow White has enacted the second Dark Curse. So, Mary Margaret (Snow's counterpart in SB) is the one responsible now. Mary Margaret still needs to adjust to the new task, though.