Sure, interesting. I guess it may come down to what the majority of civilizations did in regards to marriage, and maybe it's a toss up. If we limit it to the West, then its more clear that current traditions originate with monotheistic practices.
Only because Celtic tradition were eradicated. Early witch hunts probably ended the last remnants of our Celt heritage, and those happened after marriage was taken over by priests in the early middle age, at least in France.
The non-merchand role a celt woman with money could have was teacher, arms teacher (weirdly, we have text about that, probably because it was rare enough to be written about) or healer. That last tradition probably survived longer than druidism in my area (it is also linked to being a midwife, which was a part of life that Christian priests ignored), and was the initial target of witch hunts.
(Also, poisoning people, and especially rapists, would be something Celts women would have been very happy to do, considering Boudicca's reaction to her daughters' rape)
