She was your great aunt, then Danone.
that is what had us flummoxed - you said she was your aunt i.e a sibling of a parent and therefore child of your grandparent.
But as has been said before on this thread - you need to look for the marriage of Albert Page.
OR - if you know if she had children, you could get one of their birth certs to find her maiden name.
What is puzzling me is how you have got an exact date and place for her birth.
I can only assume from a death certificate.
In which case it would be worth mentioning, as Jan's friend therefore could not be her.