Kinky:
I checked the Roots Ireland www.rootsireland.ie indexes and there were seven Mary Driscoll baptismal records in Co. Waterford from 1853-1857. However, none of the seven were in the Lismore RC church records. Roots indicates they have the Lismore baptisms back to 1820.
Possibly she was baptized in another church but without having her parents names, it would be difficult to determine.
Let me know if you have questions.
Roger McDonnell