Brendan,
I visited that cemetery to day & unfortunately had no luck.
There are up to eight Gallagher graves,mostly in the last 40 - 50 years.
The oldest one I saw went back to 1915 & reads : Erected by Thomas Gallagher in loving memory of his wife,Catherine,died 9 09 1915,age 76.
Thomas Gallagher ,Tonery,died 26 08 1934,his wife Elizabeth,died 7.03 1989
( could have been a much younger 2nd wife)
This is a well maintained,currently used cemetery,but there were up to 12 + plots with no markings,just grassed over,a few had fancy stones added.
Annie could well be buried in some of those Gallagher graves, but been from a much earlier generation didnt have her name added when a later generation were sufficently affluent to erect a headstone.
Do you know was she was a Gallagher by birth or marriage,if the latter had she any children.
Only for you having the Newspaper obituary,I would have suggested the Old Abbey cemetery.
I was telling an older resident & she said that was used by generations & the bodies taken across the Estuary.
That would continue to be used by their descendants.
Sorry the outcome isint better.
Maura