Read other letters about this article
It may be her right to dress and do as she chooses, or perhaps as she has been subtly trained to choose; but it is an earned privilege to become a citizen of a particular country.
This woman decided, upon moving to France, to behave in a clearly non-French fashion. She went out of her way to set herself apart from the French, and does not participate in French society in any meaningful way.
They aren't deporting her, only acknowledging the fact that she just isn't French.