Snow in Summer - Jane Yolen

With her black hair, red lips, and lily-white skin, Summer is as beautiful as her father's garden. And her life in the mountains of West Virginia seems like a fairy tale; her parents sing and dance with her, Cousin Nancy dotes on her, and she is about to get a new baby brother. But when the baby dies soon after he's born, taking Summer's mama with him, Summer's fairy-tale life turns grim. Things get even worse when her father marries a woman who brings poisons and magical mirrors into Summer's world. Stepmama puts up a pretty face, but Summer suspects she's up to no good - and is afraid she's powerless to stop her.

This Snow White tale filled with magic and intrigue during the early twentieth century in Appalachia will be hard to forget.