Sans toit ni loi (1985), apparently titled Vagabond in the English-speaking territories.
A young woman wonders the countryside of southern France in winter, in dirty clothes and disintegrating boots, carrying a rucksack and an old army tent. Her only means of supporting herself seem to be odd jobs from here and there -- including, apparently, the occasional bout of the world's oldest profession.
The story is told as flashbacks from the pov of folks who've met her. Most of the people she meets seem helpful, or at least indifferent, offering rides, a place to spend the night, a little money or food. She also gets offered more long term jobs, or a plot of land to farm, but none of these ever work out, since she inevitably falls out with everyone sooner or later.
Her refusal to rely on anyone else, regardless of the consequences, seems at times admirable, at times pitiful and (I must admit) at times frustrating. Is she mentally ill? Has something traumatic happened? We don't know. She is a person hell-bent on living her life completely her own way, and her story is presented without judgment neither on her, nor on the society she's rejected.
Popped this on on a whim, enjoyed it a lot more than I thought I would.