A few trees have her parents as John and Christian, nee Grey.
One has a baptism as Christiana Grey on 26th December 1767 in Wooler, Northumberland. She was buried in Beadnell, Northumberland, on 7th November 1833, age given as 79.
No indication as to why she moved to Kent. Beadnell is on the coast and some of my wife's ancestors moved from Sunderland to Kent having worked in shipping.