Board Thread:Show-Related Questions and Answers/@comment-5989182-20140321215739/@comment-24674051-20140329225457

Maybe, although I thought in the Season 1 Pre-finale, Regina tries to have Jefferson use his Hat to get the apple, and the original attempt failed because there was not much magic left, and then Regina had to Sacrifice the ring from Daniel to generate enough magic to actually retrieve the apple. Her Magic was definitely at the end of its limits.

And then, in 'Broken', when Regina tries to use the hat again (to banish the wraith), She made the comment that magic in Storybrooke (now that it had returned) did not work quite the same way as the EF, and it actually was a result of Regina's and Emma's Magic that got the Hat going (though at the time, no one was aware that Emma was, in fact, magical).

As for the ingredients in her vault, some of those may not have appeared until Cora came to Storybrooke. Gold, however, did have the ingredients available, which he used to put David under the sleeping curse to communicate with MM and Emma when they were lost in the EF at the beginning of Season 2.