One summer in the life of a woman in an “alternative” lifestyle, and her relationship with her introverted 11-year-old daughter. The title of renowned playwright Annie Baker’s first film as a director, Janet Planet, comes from the name of an acupuncture office run by Janet (Julianne Nicholson), a 40-something single mother, somewhere in the hippie section of New England. Alternative lifestyle characters are not often the subjects of film, and that’s one of the pleasures of this one. More central is the relationship between Janet and her 11-year-old daughter Lacey (Zoey Ziegler). It is in every way not what we…