Just to confirm what heywood has said - and try and unstump!
based on the marriage in your original request I searched for a person named Anne MAHER from Clonyhage with a father named Joseph.
As there is only one Joseph MAHER in the area on the 1901 census I looked at his family with his wife Bridget BAKER.
I found at least nine children to a couple of these or similar names
One baptism for an Anne in 1881 and is transcribed as MARSHALL with a mother named BAKER and all other information similar. A check of the original baptism could confirm if this is a mis-transcription and should be Ann MAHER. There is no matching civil registration for this birth that I can see.
The 1901 census for this family shows all the children found except Elizabeth and Anne and the deceased Thomas
Joseph MAHER died in 1904
LINKThe 1911 census for this family shows widow Bridget with similar children and names however there is also a 1911 census return for Anne MAHER-DEANE with a husband and children causing confusion.
I would suggest that when you look at the 1911 census for Bridget MAHER and her family she gives her mark as she cannot read (and probably also could not write). If you look at the signature of the enumerator, James Keane, and all the writing on the page, it looks as if he may have completed the full form. This is supposition but suppose Anne was present on the day he called and he completed the form incorrectly showing her as single? It took a number of days/weeks for the enumerators to collect the forms. There were many errors where people misunderstood questions and gave incorrect information.
The Enumerator's Abstract Form was completed on April 21 1911 in Westmeath
LINKand on April 27th 1911 in Bray
LINKTo check this out for proof - I would start with the church record of the baptism of the Anne MARSHALL/MAHER to see which name is really recorded and also to see if the record is endorsed with her marriage details.
I would also look for the church record of her marriage to see if both parents' names were given there as was often the case.
These are not on-line - you would have to contact the church.