The more I stare at that pullet, the more I wonder if the missing part of the comb is making her face look longer and more like a different breed? Just a thought. Otherwise I have no clue...
I like Nuggetirl's idea of a white midget turkey. Here's a picture of a white midget turkey poult I found on Google-
But yours has a comb, not a little nub as I call it. Hmm.