What's the Name of That Book??? discussion

I first got this book when I was around five or so years old from a scholastic book fair in Michigan. It contained a series of short stories that were in the style of fairy tales, most of which centered around some kind of princess. I remember a lot of the stories involving some over-looked step-daughter saving the day.

The story I remember best was called The Little Black Box and it was about a young princess with three older step-sisters who were generally mean to her. She liked to dance with the shadows because she couldn't go to the ball. One night, an old witch gave her sisters a magic box that granted wishes and would only work if all of them were allowed to use it. The oldest stepsister wished to marry a man with power, the middle stepsister wished to marry a man who could dance, and the youngest stepsister wished for chocolate? I think and then broke the box to the MC couldn't use it. The protagonist pieced it back together wished for the shadows to come to life.
SPOILER: Turns out the shadows were people under a curse and she had freed them, She ends up marrying the shadow prince and her stepsisters get cursed versions of their wishes for being mean.

The book had a slightly textured hard cover that was a solid, sort of robin's egg blue color, and it had black and white illustrations inside that were consistently by the same person.

Winter Flower and Other Fairy Stories by Anne Montrose contains that story - not sure if it's in any other collections.

That is the book, thank you so much!