Time Travelers - Joan Holub - Bog

"Reminiscing of their time at MOA, Athena and her BFFs, the Goddess Girls, have very different versions of what really happened on Athena's first day at school. Athena decides the four girls should travel back exactly one year ago to see what really happened using a time-travel spell. Easy-peasy, right? Wrong. Somehow, Athena manages to time-travel the girls back a year--but to ancient Rome instead, where they meet the Roman equivalents of, well, themselves. With time running out for them to get back to Greece--and for Hebe's celebrations!--can the girls figure out how to work with their new friends to find their way home?"--