I know that Ellen McGrath came to the US in 1860. I find her coming into Boston. This is all the information I have.
Ellen McGrath is a very common name in Ireland. By way of example there were 343 people of that name in the 1901 Irish census. You need to try and provide a bit more information about her to narrow the search. A death certificate or marriage certificate should give you some parents details as well as an age. Have you searched for obituaries or other records that might tell you a bit more about her?
I have marriage and death certificates but all that is listed is Ireland.