She was the sister of Counts Dirk VII and William I of Holland.

Otto already had two sons from his marriage to Judith, Otto (who later succeeded his father as Margrave of Brandenburg) in 1149, and Henry (who inherited the Counties of Tangermünde and Gardelegen) in 1150.

[citation needed][dubious – discuss] In a letter, Pope Innocent III, in his third year of pontificate, admonished Otto to treat his wife with conjugal affection.

A knight tried to murder Ada in Schönwalde and was sentenced to death by Otto II.

[6] After this, she seems to have returned to Holland, since she appears in a charter of 1205, making a donation to the abbey of Rijnsburg, with the consent of her mother, Ada of Huntingdon, her brothers William I and Florence, Bishop of Glasgow, and her niece Ada, Countess of Holland.