She was a traitor to her own family and people though. Just like women are prone to do.
Ruth originally married one of Naomi’s sons, then he died, and the widow Ruth went with her widowed mother-in-law to Bethlehem.
If Ruth was a traitor, it was when she originally married a non-Moabite. Both she showed exceptional loyalty to her mother-in-law, and God rewarded her for it!!!!