Without a strong protagonist to follow, Lost Girls And Love Hotels flounders.
The film’s issues with Margaret would perhaps be more tolerable if it were a two hander, occasionally cutting away to events in the life of another character, but that’s not the case, as she is at the center of every scene. With zero motivation, her story as no arc and therefore fails to meet the basic requirements of a story (though don’t think that the movie doesn’t attempt to totally fake it in its final moments, because it tries very hard to convince you that non-existent change transpires). It’s all just a cycle of sadness, fast cut sex scenes, and more sadness. And it gets tedious fast.