Her death would have been registered in Wicklow but that is in the Superintendent Registrars District of Rathdrum.
Have a look at the top of the image.
I was surprised she wasnt in Wicklow but if you look there are no deaths in Wicklow in 1927 so I think its a case of Wicklow becoming a Superintendent District at a later date.
Edit, putting in Wicklow as the Reg District on Irish Genealogy for Births, Marriages and Deaths there are only 98 results