This means that her motivations have to have been triggered by something that could plausibly have happened here, in the 'land without magic'.
Any chance Tamara could be an existing non-fairy tale character completely messed up by having been sucked into a fairy tale world and now is out for blood? Like Alice or even Dorothy?
Or, again because of the connection to the photograph and how much it meant to her as determined by the Dragon, she's the granddaughter
of such a character. Wendy is still the top candidate for me.
And yes, that would make her both a completely original and completely human character, too.