Fermoy Poor Law Union Workhouse

My great grandmother Margaret Teresa O'Toole not sure if the Ó' was added to her name on arrival to Australia as her father's records I have managed to locate don't show the Ó"in the name.  Margaret Teresa, known as Tess was born in the hospital of the Femoy Poor Law Union complex and I am keen to locate records of the workhouse, and would appreciate if you could provide some assistance.  Tess''s parents were Pierce Toole and Anne Jones married in 1842 in the parish of Rathcormack.  I don't know if Tess's parents stayed in Fermoy or moved elsewhere.  Kind Regards Jennifer