Catherine Delia Murphy's family

I live in Seattle, Washington, USA and was born in New Haven, Connecticut, USA, in 1938. I am trying to locate any information about my grandmother, Catherine Delia Murphy, who was born 09 April 1871 in Roscommon, Kilkorkey Parish. She emigrated to the United States (I assume in the 1890s but do not know for certain) and married Christoph Francis Ermer (who was born in Germany) in the State of Rhode Island, USA, on 11 April 1898. Catherine died in Connecticut in 1943. I know nothing else about her or her origins and hope someone in Ireland will turn up information about her, her family and/or her forebears.  I always understood from my deceased mother that Catherine came from Roscommon.