Welcome to the Co Roscommon IrelandXO community!
Lissaneaville is a townland just east of the village of Castlecoote.
She would have been interred at the ancestral family graveyard (wherever that may be) and not necessarily the one nearest Castlecoote, although it's worth a check.
Have you tried searching the igp web database?
New cemetery records are constantly being added so it's worth keeping an eye on.
As they were hotel keepers, odds are high they could have afforded a lengthy obituary. Have you tried the Ireland section of the British Newspaper Archive?
Failing that, the Irish News Archive has additional papers for your counties of interest.
Best of luck!