We don't know that this woman was living in the trailer. Perhaps she was traveling with her trailer and stopping for a night or two to visit friends or family, which would be legal, although it might violate homeowner's association rules in some areas.

What we do know is that many people are living in old motor homes, travel trailers, or even in their cars due to a lack of alternatives, and that our zoning and parking laws have not been updated to address this reality. We should not assume that this was the case here, but even if it was, the zoning ordinances themselves are obviously not the primary consideration.