No sadly.... 3 August 1856, at Canton, aged 35, wife of James McCarthy, labourer. Cause: puerperal peritonitis, certified. Informant: mark of Lewis Sullivan, present at the death, of Canton, Llandaff, on 4 August.
Guess I was hoping Johanna was born Johanna Sullivan so that Lewis might have been her father or a brother, but no relationship given at that time.