This is probably the Margt Galvin who was godmother to her nephew George Clancy in 1860. The custom at the time appears to have been to record the maiden names of baptismal sponsors.
If her husband was the married Thomas Kane who died in Donaboy [sic] in 1870, then Peggie outlived him.
Sources
Marriage record in still (2021) unmicrofilmed Kilkee marriage register.
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DNA Connections
It may be possible to confirm family relationships with Peggie by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Peggie: