She was born on an unknown date, prior to 1182 and died in the Monastery of Celas, Celas on March 13, 1229. Her body was moved to Lorvão. She was the feudal Lady of Alenquer. On December 13, 1705 Sancha was beatified by Pope Clement XI's papal bull Sollicitudo Pastoralis Offici, along with her sister Teresa of Portugal.