Hi Mary. I'm not certain if my great grandmother, Agnes is the same person as your grand-aunt Agnes, because I have Agnes's sisters as Rose and Sophie. Because we have similar names, we are probably within the same family. I have limited information on this line, but I will be happy to email you a pdf file of what I have you could please email me at firstname.lastname@example.org.
The line I have is as follows: Agnes Ann Urban b.1910 (my great grandmother)-> William Urban b.1879 -> John Urban b. 1842