"Goddess for a Day" is a short story by Harry Turtledove, published in Chicks in Chainmail, edited by Esther Friesner, Baen 1995; reprinted in the omnibus Chicks Ahoy!, 2010; and Counting Up, Counting Down, Del Rey, 2002. It can also be read on Baen's website. It is a historical fiction which introduces fantasy elements in the later part.