House of Dreams by Pauline Gedge

In the tiny hamlet of Aswat, far to the south of the royal capital, a beautiful young girl wants more than the meagre prospects her village offers. Determined and resourceful, she is quick to leap upon an opportunity when the great seer Hui, who is also physician to Pharaoh, visits Aswat to commune with its god, Wepwawet. Taken under Hui's wing to become a healer, she has no idea of his real plans for her-plans that will bring her close to Pharaoh as his favourite concubine, but will ultimately enmesh her in court intrigue of the most dangerous kind.
House of Dreams is a powerful story of passion and jealousy, rich with the details of Ancient Egyptian life.