I lived there during the 1960s and there was a man named Mc Geogh who owned the Swan. He had 2 daughters. I cant remember their names. It is possible that this lady was buried in Haggardstown OLD cemetery, which is located on the old golf links road near Blackrock, a relatively short distance from the newer cemetery and Blackrock village. I dont think Mr mc Geogh lived in Blackrock. He travelled from North of the village I think. Perhaps if you check the registry of deeds you could get his address. He sold the place in the early seventies to a man called Oliver Murphy and it was later bought by a Mr P . Smyth.
Perhaps she is buried near the home of Mr Mc Geogh,so if you had his address, you might find her whereabouts. Alternatively you could phone the parochial house for Blackrock and ask them to check the registers.
Good luck
