Hello John, your Mary was the sister of my Jane Rudd Cartledge and they were born in Houghton-le-Spring, Durham.
Like Mary, Jane and her husband John Nicholson immigrated to Pennsylvania then onto LaSalle County, Illinois.They stayed in Illinois, although John died in Paennsylvania and Jane remarried to a George Beadling.
Their parents were Ann Rudd born abt. 1810 and James Cartledge born about 1810, both in County Durham.James died 7 February 1839 in Houghton-le-Spring, Durham, and Mary on 21 December 1842 Houghton-le-Spring.
They married 5 June 1833 in Monkwearmouth District of Durham.
I think that Ann Rudd was born on 4 January 1810 in Kirk Merrington, Durham to a William Rudd and Mary Coates.
After Ann Rudd's husband James died she lived with her mother Mary Rudd, and daughters Jane & Ann Cartledge.
Jane and family arrived in New York on 9 December 1863 and they went to Clearfield County, Penn. They had 3 that I know about,children John James, Rachel Grace and William Nicholson. Rachel was Dad's Grandmother.
I have more info on this family so would be happy to keep in touch with you.Hope this is a start of helping you trace your English roots.