Hi,
I am interested to see if you have more information about this person's family.
I have Anne Nolan, who was born in about 1836 and married about 1857. Could she be a possible sibling? I don't know her parents.
I also have a Mary Murphy, father unknown at this stage, who was married to a James O'Brien about 1860ish. Could this just be a coincidence of names you reckon?