A sad tale repeated many times in Australia and the Americas.
I searched the IFHF's online database at ROOTSIRELAND.IE. It contains abt 19 million B/M/D records for MOST Irish counties. This includes parts of Tipperary. The rest of the Tipperary records are held by the Tipperary Family History Research Center. They are available at a large fee. There is no refund if the Center's search finds nothing.
I couldn't find either B or M records for Margaret Henry in or around the dates and names you provided. Many pre-1850 B/M/D events either weren't recorded, or records haven't survived.