Born
My estimate of Elizabeth's birthdate is speculative, based mainly on the date of christening on one son, Matthew Copeland, in 1757. I assume that Elizabeth was aged around 21 at this date.
Married
Elizabeth must have married William on or before 1757 because a couple named William and Elizabeth Coupland/Copeland/Copling had at least three children between 1757-1760.
Children
If you accept the spelling change from Coupland to Copeland (which makes good sense in terms of the regional accent) then William was named as the father at the christening of his son Matthew on 15 MAY 1757 at Whittingham, Northumberland (England)[4]
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Elizabeth is 32 degrees from Emeril Lagasse, 30 degrees from Nigella Lawson, 33 degrees from Maggie Beer, 57 degrees from Mary Hunnings, 36 degrees from Joop Braakhekke, 40 degrees from Michael Chow, 32 degrees from Ree Drummond, 34 degrees from Paul Hollywood, 31 degrees from Matty Matheson, 34 degrees from Martha Stewart, 39 degrees from Danny Trejo and 36 degrees from Molly Yeh on our single family tree. Login to find your connection.
[Do you know Elizabeth's family name?] > Elizabeth Unknown