3-year-old Alyvia Navarro has passed away at Boston Children's Hospital after being found in Dick's Pond.  The autistic child reportedly wondered away from her grandmother Tuesday at the Lakeside Trailer Park and was found about 25 feet from shore in the pond about an hour later.   The girl was given life-saving medical attention, taken to Tobey Hospital in Wareham, and then airlifted to Boston Children's Hospital.