Hi Tullagh,
What a surprise out of the blue. The photo of your Catherine Kelly is beautiful.
I've had a quick look at the papers I already had and haven't seen a direct connection but there could well be one. My g-g-grandmother Ann Kelly (father James, mother Catherine) was born December 1856 West Auckland, Co Durham but older siblings John, Catherine, and younger siblings William and Edward were all born in Willington.
So my g-g-grandma Ann would be pretty much contemporary with your Catherine Kelly.
There was never any mention of Whitehaven from my Gran but then we had no idea either that her mother's family lived in Willington. So there's plenty to be working with.
Of course, it could still be a coincidence - Kelly is common!
Have you any more Kelly info.? And are you in England, Ireland or Timbuktoo?