Her birthdate is generally believed to have been between 1060 and 1064; however, there is some evidence she was born after her father's accession to the English throne in 1066.
Adela was regent for her husband during his extended absence as a leader of the First Crusade (1095-1098), and it was at least in part at her urging that he returned to the east to fulfill his vow of seeing Jerusalem. She was again regent in 1101, continuing after her husband's death on this second crusading expedition in 1102, for their children were still minors.
References
Kimberly LoPrete, "The Anglo-Norman Card of Adela of Blois", Albion 22 (1990)
Kimberly LoPrete, "Adela of Blois and Ivo of Chartres: Piety, Politics, and the Peace in the Diocese of Chartres", Anglo-Norman Studies 19
She married Stephen Henry, son and heir to the count of Blois, sometime between 1080 and 1084, probably in 1083.
Adela was regent for her husband during his extended absence as a leader of the First Crusade (1095-1098), and when he returned in disgrace it was at least in part at her urging that he returned to the east to fulfill his vow of seeing Jerusalem.
Adela retired to Marcigny in 1120, secure in the status of her children.