kanga1641 on Family Tree Circles

I have reached a dead end in the search for Mary Ann Oakley who was my great great grandmother. I would like to know her parents names and country of origin. She married Frederick Max de Radek in 1876 and Thomas Brady in 1880 both in Brisbane. I can find no death notice for de Radek so I'm not sure of the reason for the 2nd marriage. She had children to both husbands.