Perhaps a daughter of Anna, king of the
East Angles, Wendreda may have grown up at Exning near Newmarket. Three of the daughters of Anna married kings, but, instead of marrying, Wendreda became a nun and a herbalist, expert in the arts of healing sick people and animals. She established herself in the wetlands of
the Fens and according to one source founded a
Benedictine nunnery at March, where she spent the rest of her life. She became famous as a healer, and eventually miraculous powers were attributed to her.
Frances Egerton Arnold-Forster wrote in 1899 that Wendreda may have been an abbess, "for a little piece of ground opposite the church still retains its old name of 'the Nunnery'." She adds that an old coffin-lid was discovered there and moved to the churchyard and quotes the Rev. Charles E. Walker, Rector of March in 1890, as saying "It is evident that there was a small conventual establishment there, in all probability connected with S. Wendreda, but no trace of foundations or document can I discover."
Agnes Dunbar said of Wendreda a few years later ==Relics, church, and well==