Who is Baketamon / Baketaton from Sinuhe the Egyptian: A Novel and what is their importance?

Baketamon is the Priestess of Sekhmet. She is described as a haughty soul, whi is determined to keep her virginity until an appropriate royal comes along. Egged on by Nefertiti, Bakematon convinces the Hittite King Shubbiluliuma to send his handsome, virile son and heir, Shubattu, to marry her.