Well. All Regina broke was the memory part, I -think-. They’re still in Storybrooke, after all (though to be fair they were last time, too).
Secondly, Regina was the first person to give Henry a TLK after he believed.
It may have more to do in this particular case with Henry than with which mother kissed him.
However, it occurs to me that since they used Charming’s heart to cast the curse, their TL is still all over it.
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing