Thank you for your query. To find any existing records on Ellen Sullivan you will need an exact place of origin in Cork. Did she emigrate?Remember to post as much information as you can with regard to the people you are researching. The more information you post, the more likely it is that one of our volunteers will be able to advise or assist you. Also include information concerning which sources you may have already used so others may further your search.
Here are some general genealogy websites that may be of help to you :