Grade 4-7-Abandoned at birth, Hollis Woods has lived in about a half dozen homes and has always wished for a family. A foster caretaker describes her as "a mountain of trouble." When Josie Cahill, a retired art teacher, takes the 12-year-old into her home on Long Island, NY, the two bond almost immediately. Hollis draws pictures with colored pencils and Josie carves branches into people. Howeve…