Kiltaglassan, using the links you provided, together with Google Maps and Street View, I viewed the Catholic church in Knockaunnacarragh townland (Mary Immaculate Queen). I googled to find out more about the church, and discovered that the former church on the same site, St James, was built in the 1830s, and stood until replaced by the new, much larger church in the 1970s. (Apparently there was a much smaller St James Church with thatched roof on a different site close by, and it was in use up until 1839).
I also found out that in the old days there was no parish of Barna. Barna/Freeport was part of Rahoon Parish until 1952. This makes sense, it explains to me why my great-grandmother Mary Josephine Donnelly, daughter of Winifred and Thomas, was baptised in Rahoon Parish, even though the parents' place of residence was Freeport.
About locating the site of Winifred's grave, I probably now have enough information to be able to contact the Barna/Furbo Parish office and ask them for assistance.
I would have liked to attach a historic photo of the second St James Church that was used from 1840 up until the 1970s, in case it's interesting for someone else as well as me. I found the photo on the Kenny's Bookshop website. Sadly, I'm not game to attach the photo, in case I would be breaching copyright.
Here's a link to the relevant page on the Kenny's Bookshop website.
https://www.kennys.ie/old-galway/1760-15the-church-of-st-james-barna-02-03-2017
