Divine by Mistake: The Partholon Series, book 1 (Partholon, 1)

It s the beginning of summer break, and high school English teacher Shannon Parker is ready to relax poolside with some red wine and a good book. She s friggin earned it! But first a little shopping, a la fancy estate auction. Surrounded by old folks and even older artifacts, Shannon never expects to find something that shocks her down to her very core: an ancient vase, complete with a beautiful painting of a goddess that looks just like her. And just as she s stealing away with her seriously suspicious purchase, she s magically thrown into the world of Partholon, where not only has she taken the place of Rhiannon, Goddess Incarnate and Epona s Chosen, but she s due to be married to a surly (but oh-so-handsome) High Shaman centaur, ClanFintan. But serving as Epona s Chosen isn t just luxury baths and buff horse-guys. A dark power grows in the wastelands to the north, and Rhiannon will need much more than just the favor of Epona to protect the land and the man she s grown to love.