Hi Sharon,
I was able to find a burial/death record and a marriage record for Isabella Dwyer via
Roots Ireland as well. Did you get a chance to take a look at these records? They might mention where Isabella was born or where she was from, and that way you know in which archive to look. Sometimes you can find information of parents or relatives as well.
After 150 years Goldenbridge Cemetery
reopened to the public on the 14th of May 2017. There are tours of the grounds available, and if you
get in touch with them they might be able to tell you more about Isabella's story.
I hope some of our other experts can shine a light on it as well, and please keep us posted on your findings. :)
Wishing you the best of luck on your search,
Melin