My grandmother told me that her aunt Anne Sheehy married a Patrick Costello. Anne was born in Limerick, close to the border of Tipperary I believe.
I can tell you that her father was indeed John Sheehy.
I don't have much info on Anne and have always tried to find her on records as all the other parts of the family history that my Nana told me have been found to be correct.
I am curious to see if your Anne is the lady my Nana told me about.