Newtownpark, Blackrock, Co. Dublin is very close to Deansgrange Cemetery.
Loughlinstown Workhouse had its own cemetery at Cherrywood Road, Dublin.
For burial records for this district see dlrcoco.ie/en/cemeteries/burial-records
That she was the wife of a labourer it is unlikely that the family could have afforded a headstone or newspaper obituary.
- I checked the newspaper archives just in case but no results, unfortunately.
For more links to burial records resources see researching-irish-burial-and-death-records