Mulrooney/Mulroney

I believe my great-greatgrandmother Mary Ann Mulrooney and her sister Catherine, and brother Andrew worked inthe Carlow workhouse. Andrew was born in 1833, Mary Ann in 1834 and Catherine in 1836. Is there any way of accessing the records and finding out if this is correct. Mary Ann and Catherine immigrated to Australia in the 1850s. Many thanks, Therese Moloney