I found this baptismal record transcription on the subscription site Roots Ireland. If this record is for your Mary Fitzgerald then Rathwire townland in Killucan civil parish Co. Westmeath is the correct location.
Name:Mary Bidilia FitzgeraldDate of Birth:16-Aug-1879
Date of Baptism:17-Aug-1879Address:RathwireParish/District:KILLUCANGender:FemaleCountyCo. Westmeath
Father:Francis FitzgeraldMother:Bridget Not RecordedOccupation:Not Recorded