The DOB for Hessie is in the RootsIreland record which is pay to view.
There are 5 other children besides Hessie (ie. 6 in total) shown in the index against William Kerrr and Jane Long, in short:
Elizabeth 1873, Sarah 1875, David 1878, William 1879, Elizabeth 1882, Hessie 1884
Elizabeth 1882 could suggest that Elizabeth 1873 died early. I was thinking of Elizabeth 1873 when I posted about the age of Elizabeth Simpson (Harvey St., 1911 census) being "quite a bit out", it was probably Elizabeth 1882 that married David Simpson (not spot on, but a lot closer).