To quote the guidelines for the Head of Family:
NAME AND SURNAME of every Person, whether Member of Family, Visitor, Boarder, or Servant, who
- passed the night of Sunday, April 2nd, 1911, in this dwelling and was alive at midnight, or
- arrived in this dwelling on the morning of Monday, April 3rd, not having been enumerated elsewhere.
No one else must be included.
It is as if the author, her father Thomas Doherty, remembered that she was staying elsewhere and so should not be noted down. The inscription error is understandable as to exclude his child may have seemed counter-intuitive.
I am currently looking at some other records to see if I can spot her in another household. I will update this when I have checked them out. Any other suggestions would be most welcome!