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I searched on the subscription site Roots Ireland and the closest Ellen Mulvey baptismal record in Co. Leitrim is the 1828 record below.
I did not find an Ellen Mulvey/William Walsh marriage record.
Name:Ellen MulveyDate of Birth:
Date of Baptism:14-Apr-1828Address:
Parish/District:FENAGH ROMAN CATHOLICGender:FemaleCountyCo. Leitrim
Father:Michael MulveyMother:Ann Flynn