I think we are, perhaps, looking for information about the same Catherine O'Hearn (1837 - 1878)? The one I am looking for married Jeremiah Duggan (1828 - 1906) and they are buried in St. Patrick's cemetery in Maple Grove.
I have information on her descendents through their son John Patrick Duggan, my great-great grandfather -- but I know nothing of her ancestry. Anything you may have about her is of interest!!