NN Mother to Donald Scotland

Would like to see references / documentation (other than something from someone's tree that may be in error) on her parentage as her surname ingen Griogair does not in the least indicate a name link to the person connected as her father. In fact, need validation of her being Constantin's wife and mother of Domnall.

Constantine spent most of his reign fighting to consolidate and expand upon the Kingdom of Scotland created when Kenneth I had brought together the crowns of the Scots and the Picts to form the beginnings of what became known as Alba. To the south he battled against the King of Strathclyde. This culminated when he arranged the death of the King of Strathclyde in 872. He replaced him with his own brother in law, Rhun: effectively making Strathclyde a subordinate kingdom to Alba.