Was this Maddison Grey, father of the Margery Grey, bapt Stanhope 09 Feb 1679, the same person who was baptized in Stanhope, 07 Feb 1622? He would have been at the advanced age of 57, so it raises the possibility that the father of Margery was a younger Maddison Gray, perhaps the son of the person baptized in 1622.
I don't see any parish records in this time period for any other Maddison Gray.
Note that Margery Grey was the youngest of at least 8 children born to a Maddison Grey in Stanhope from 1663-1679. Also note that the Grey surname was alternately spelled Gray.
There is a burial record in Stanhope in the year 1700 for a Maddison Gray, no age given.