Actually, I've seen quite a few of these. White as snow or ricotta, perhaps, or red as wine -- but a fair number of brides. Leading into either a Faithful Johannes story or a story of a proud princess who sets impossible tasks and then beheads her suitors. More than Snow White tales with it, in spite of having read through a whole pile of Snow White tales recently.
So was naturally puzzling with it a bit. Two people wish for her, her mother before her birth, the prince? Except of course that the proud princess does not mix with Snow White at all, at all -- though Faithful Johannes might. The thing being that there would then be the prince, the Snow White, and the faithful servant/brother who is the hero of Faithful Johannes. Complicates the plotting.