Tim:
Welcome to Ireland Reaching Out!
I searched on the subscription site Roots Ireland and the earliest Cornelius Lenehan (and variants) baptismal record I could locate was in 1840 which appears to be too late for your interests. I also could not locate the record for Mary Looney but did find two baptismal records for younger siblings of Mary. The first was in Croom and the second in Manister which would normally be the parish for people living in Monateranenagh civil parish. The transcription of the 1839 record showed an unusual name so I went to the parish register and saw that the name was Johanna.
https://registers.nli.ie/registers/vtls000634976#page/73/mode/1up
I also located the 1833 marriage record for Patrick Looney and Johanna Hartigan.in Manister. So was Mary 15 when she married or did they marry later?
Roger McDonnell
Name:Na. LooneyDate of Birth:
Date of Baptism:24-May-1839Address:?Parish/District:CROOMGender:UnknownCountyCo. Limerick
Denomination:Roman Catholic
Father:Patrick LooneyMother:Johanna HartiganOccupation:
Sponsor 1 /
Informant 1:N. RSponsor 2 /
Informant 2:Jna. Connors
Name:John LooneyDate of Birth:
Date of Baptism:15-Jun-1841Address:
Parish/District:MANISTERGender:UnknownCountyCo. Limerick
Denomination:Roman Catholic
Father:Patk. LooneyMother:Johanna HartiganOccupation:
Sponsor 1 /
Informant 1:Patk. MurphySponsor 2 /
Informant 2:Mgt. Hartigan
Date of Marriage:01-Nov-1833
Parish / District:MANISTER
County:Co. Limerick
Husband PatrickLooney
Wife JohannaHartigan