The Witch's Egg by Donya Todd

It was a spiderweb moon. And the imps did wonder. What dark delights wouldst the cat-witch conjure. By the Sardine Queen, by salt and the devil, by blackwormy earth, and by the deep, dark sea, the catwitch Urfi conjures an angel to love her and have children with her. But angels aren't meant for love, and with the embryonic egg of their unborn children, Urfi flees from her partner's violence, enduring terrible trials to find a new and safe home in the faery forest. As her children, Isobel, Batzel, and Mazel, grow up with her, they find the horrors their mother endured during her flight to the forest returning to their lives - this time for the three of them to defeat for good. With secret magic, solemn bonds of friendship, and sisterhood, they can at last stand against the threat of the angels' terror and insanity. A gorgeous intergenerational family story of promises made, promises kept, and a mother who would do anything to protect her daughters.