Samantha Montgomery, 38, lives on her own in one of New Orleans’ toughest neighborhoods. By day she works as a caregiver for the elderly; at night she transforms into Princess Shaw, belting out soulful originals at sparsely attended open mic nights and posting homemade a cappella clips on YouTube to a handful of followers. One of them is Kutiman, a.k.a. Ophir Kutiel, an Israeli musician, who mixes together one of Montgomery's clips with instrumentals posted online by random musicians. A rousing documentary crowd-pleaser about a star-crossed singer-songwriter and her crafty secret admirer, “Thru You Princess” examines loneliness, anonymity and connectivity in the Internet age, where showbiz dreams remain but a mouse-click away for even the most hardscrabble.