Edith Maud Deane nee Hancock was buried at Trealaw Cemetery (between Trealaw and Porth), she was living in Porth in 1911
Her grave number is C404 and her interment reference number is 39403
If you send an email request to Treorchy reference library (Gillian.Thomas[at]rhondda-cynon-taf.gov.uk) stating :-
Death 1931
Grave C404
Interment notice 39403
Name Edith Maud Deane aged 44
Treorchy reference library will send a copy of that interment notice free of charge by return email and this will state her date of death, where she died, burial details etc etc (it won't give you a cause of death but everything else)
Extra information, also buried in the same grave seems to be another daughter Violet May Deane who died aged 3 months, she was buried in 1911. To request a copy of her interment notice quote
Death 1911
Grave C404
Interment notice number 20727
Name Violet May Deane aged 3 months
Violet May's birth was registered in the June quarter 1911 at Pontypridd 11a / 596 and her death in the September quarter 11a / 680
There is also another person buried in grave C404
Death 1948
Grave C404
Interment notice 53029
Name William James Pearce aged 86 ...... not sure how he fits in