Rose may have been born in Killaghtee circa 1785. She eventually married Francis/Frank Carrigan/Kerrigan circa 1805 (both dates +/- 10 years). Any clues would be most welcome.
AB Wheeler:
Welcome back to Ireland Reaching Out!
The RC records for Killaghtee parish do not begin until 1845 so no baptismal record is available.
http://registers.nli.ie/parishes/1007
I also looked at the 1857 Griffiths Valuation head of household listing for Killaghtee and there were a good number of Lyons records across a number of townlands.
http://www.failteromhat.com/griffiths/donegal/killaghtee.htm
Have you had an autosomal DNA test?
Roger McDonnell