Scarabian nights - Nancy Holder

When Aunt Vesta brings Sabrina a souvenir from her trip to ancient Egypt, Sabrina, Salem and Valerie are transported back in time to serve Bast, the Cat Goddess, who immediately falls in love with Salem and casts a spell on him to make him fall in love with her. But when Sabrina tries to break the spell, she is caught and thrown into a pyramid with Valerie. The two girls rely on buried objects and a revived teenage pharaoh named Kutanhansum to find their way out of of the maze within the pyramid and back to Bast's palace before Salem is forced to stay with Bast forever...as a mummified cat!