House Of Frost And Feathers:

"Marisha's time is running out. She's already lost her family to the sleeping plague, and she fears she'll be next. Penniless and desperate for protection, Marisha is forced to accept a job as apprentice to the notorious koldunya, the sorceress Baba Zima. But Baba Zimais renowned for being both clever and cruel. And most difficult of all is her current apprentice Olena, who wants nothing to do with Marisha. Despite her fears and Olena's cold demeanor, Marisha finds herself drawn into the magical world of koldunry and delves further into Olena's research--a cure for the sleeping plague"-- Provided by publisher.