Please can anyone help

I am trying to find out where my Great x2 Grandma was buried.
I have her Bapt, all the census and now her death certificate but can not find where she is buried.
Trealaw, Treorchy and Ferndale cemeteries have all been checked. She is not there. Llanwonno Parish church has also been checked. The local newpaper was also check for a report on her death but none was found. I have the following information.
31 October, 1916, Ann Thomas wife of Morgan Thomas aged 83 years (really 87 years) of 8 Railway Terrace, Ynyshir. Informant Brynely Thomas, Grandson, 137 Aberhondda Road.
Does any local know of a small graveyard in Ynyshir?
Thank you.