I'm hoping Ken Turner will see this posting and respond. I think your great grandmother is Margaret Wignall who married Thomas Pilkington. They had 2 daughters and your the descendent of one of them?? I have your Margaret in Australia and would love to give you the information you may want...marriage certificate, death certificate, and other siblings (step).
I sent email to your 'old' email and it bounced, so I hope your still searching and come across this.