I am assuming that this Ellen D Bigelow is the person who married Sir John Baguley.
In this case several family trees on MyHeritage state her birth date as 1455 (at Ollerton Hall, Cheshire, England) and dying in Knutford, Cheshire about 1533. They had at least one child - a son, Richard.
I did find one family tree on MyHeritage that stated they were married in 1473. As girls were often married quite young, they could have married anywhere after 1467. A marriage date of 1473 seems quite plausable.
But no guarantees....!