Wraiths of Time — Andre Norton

HANDMAIDEN OF THE GODS

Abducted by powerful spirits released from an ancient ankh, talisman of Egyptian gods, young archaeologist Tallahassee Mitford suddenly found herself hurled back in time to a strange Nubian kingdom called Meroe. There, moved by forces beyond human comprehension, she learned the reason for her summoning.

In the land known as Egypt's darker sister, Tallahassee Mitford became Ashake, the reincarnation of a magnificent warrior princess, a priestess of power ordained for a destiny of war against unearthly forces of evil -- and the unfathomable specters known only as the wraiths of time....