Castle Matrix

Hello! I am traveling to Ireland in June from the U.S. and am looking forward to visiting the land of some of my ancestors. I have a couple of ancestors who were born in Castle Matrix (Gertrude Southwell Pigott and her son Southwell Pigott). From what I have found online the castle is now the private residence of Elizabeth O'Driscoll. Does anyone know how to best contact Elizabeth? I would love to visit the castle and would like to get permission to go on the grounds to take pictures. I've also read it can be tricky to locate. Any advice on how to find the castle would be much appreciated!