She was the daughter of King Edgar of England and Wulfrida. She was born at Kensing, England, in 961, and was brought as a very young child to Wilton Abbey by her mother, who later became a nun there and Abbess…
Saint Edith became a nun when fifteen, declined her father’s offer of three abbacies, and refused to leave the convent to become queen when her half-brother, King Edward the Martyr was murdered, as many of the nobles requested.
She built St. Denis Church at Wilton. Saint Dunstan was invited to the dedication and wept much during mass. Being asked the reason, he said it was because Edith would die in three weeks, which actually happened, on 16 September AD 984.
From Here