The Ellen Sherlock who married John Moles in Ireland is most likely Ellen Sherlock b Skerries 19 Aug 1904. She has the same father's details as on the marriage cert and is also on the 1911 Irish census. She is about the same age as John Moles, if he is her husband.
I can put up some images or you can look yourself here:
https://www.irishgenealogy.ie/en/
Civil Record Search.
Oh, I could look to see if that Ellen remarried after her husband's death. That would possibly eliminate her!