Keepers of the Ancient Wisdom (Kalie's Journey #3) by Sandra Saidak

After more than a year as a slave to the brutal horse nomads, Kalie returns to the Goddess Lands to face her greatest challenge. Varlas of the Wolf Tribe has united the clans, and leads his horde to conquer Kalie's home and replace the Goddess with gods of war and thunder. The only hope for Kalie’s people is her lover, Riyik, and the warriors who follow him. They must turn peaceful farmers into warriors who can defeat Varlas' mounted host. But not everyone in the Goddess lands will accept this transformation. Kalie and Riyik must fight enemies from without and within to save their home. As the mounted horde bears down upon them, all Kalie can be certain of is the Goddess Lands will never be the same...