To find their deaths you would first have to establish whether they married as the death would be in their married name.
The online GRO register only covers deaths to 2007. After that date you have to use GRO online which has deaths to 2023. https://www.gro.gov.uk/gro/content/certificates/Login.asp
Your post needs to be on the Hereford board so I have asked the moderator to move it for you.
As a basic researcher I’m drawing a black finding any existence of Nelly Green bn 28th Nov 1926, under the below GRo details of, it says the volume number is invalid . I’ve requested a manual search and copy if they find it , I can’t even find a death certificate under her birth details , it’s very frustrating, are you able to guide me to find her somewhere else?
Nelly Green
Registration Date Jan 1927
Registration Quarter
Jan-Feb-Mar
Registration District
Ledbury
Inferred County
Hereford & Worcester
Mother's Maiden Name Coley
Volume Number 6a
Page number
667