As you point out in your question, choosing your battles is always important, be it with toddlers or adolescents or fledgling adults. Cleanliness is an area where I feel it is important to insist on some parameters. As she is not a hermit living in a cave on a deserted island, her lack of bathing affects others, her family, friends and classmates. Everyone has to put up with the normal body odors that accumulate each day – sweat, dirt, dead skin, hair and skin oils, etc. In addition, like it or not, the adults with whom she interacts will be put off by her lack of attention to normal hygiene, no matter how sweet a child she may be.