I think that Emma could be an Alice-like figure. She went through a metaphoric rabbit hole when she was transported out of FTL in a wardrobe. She is in a world she doesn’t really belong in. She has the magic to make a portal to another world. She even has a white rabbit decal on her car. 
There is some more discussion about this on the Emma character analysis thread. https://oncepodcast.com/forums/viewtopic.php?f=35&t=264
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy