Must admit I thought the grave book had that detail but I havn't researched late 19th C - if it was a pauper's grave then these were usually allocated in a a special area of the yard and thus it might be worth looking at adjacent plots to see if these too have the same characteristic of multiple and apprently unrelated burials. The mother of the Mary Kneen figured in the transcribed list of those receiving relief from the poor house (judging from comments made in acompanyng documents many others were in need of such help but only the most desirving cases got any money)