Newbie here, any guidance or help greatly apprecited

My Gmother was Margaret Whelan (nee Burke) she died in Co home Cashel, this is now St Patricks hospital. I have found that there is a record of her death registered there, but no information on where she was laid to rest???
On her death certificate it says Margaret Whelan from Clonmel, I have done on line searches for any cemeteries I know of, but just cant find anything. She died in 1942, so its not if though its that far back really.
On my Gparents marriage certificate, my Gmothers father is Peter Burke of Marlfield (obviously my GGfather). Also it shows on the marriage certificate is my Gfathers father Patrick Whelan, of Marlfield. My Gfather was his son Timothy Whelan.
Its strange how things happen I found a Burke family at house 29 Marlfield on the census, there were quite a few family members and they are obviously my relatives.
I am wondering if my GGfather was a groom at Marlfield House as thats what it says next to his name, and whether my other GGfather was a labourer there.
I cant find where my Gmother Margaret Whelan (nee Burke) was laid to rest, and as regards my Gfather Timothy Whelan, I dont know if he died in Ireland as he was a soldier in ww1 and then a mounted policeman in india, but Im thinking he must of come back to Clonmel at some stage or my mother and Gmother would not of been in Clonmel in 1942, when my Gmother died.
Sorry if this is hard to follow, i made a promise to my Mum, so I would like to ask if anyone has any information. My parents were Michael Hayes and Margaret Hayes (nee Whelan) my mum was from Clonmel and my Dad from Co Kilkenny. Its just not knowing which way to turn to find out anything.