Germanic it is then, already looking into the Pre-Roman Iron Age of Northern Germany. I'm thinking she will be like a scout for a newly settled tribe. She is seeking new and unique resources for her people (or is supposed to be), but finds herself enjoying the freedom of being out on her own. She'd mostly pray to Wodan (Odin) to protect her on her travels. 

Or, I was thinking of making her a slave who survived a ritual drowning. She was an attendant to the Goddess Nerthus and as is tradition, after 2 slaves wash her and her chariot at the end of her roaming feast, the slaves are then drowned in Nerthus' lake. My character would have escaped through trickery on her part and then left to travel the world.