I've some bad news about the Countess of Buchan I'm afraid, Kim. She was the lady who was suspended in a cage in Berwick for four years (something that anyone who has ever spent an afternoon in Berwick will sympathise with her for). Her crime was to have placed the Crown on the head of Robert the Bruce during his coronation, thus incurring the displeasure of King Edward of England.
After four years in the cage, she was sent to a convent, like others including the Bruce's sister, wife, and daughter. However when these women were released after the Scottish victory at Bannockburn (1314), the Countess of Buchan was not among them - so we can only assume she had died in the meantime.