Ada PARKES appears in the 1901 census living with her sisters and their families. She was 15 and a cotton worker. After this she cannot be found.
She doesn't appear anywhere in Britain in the 1911 Census, and she is not found as Ada PARKES in the 1939 Register. There are no marriages in Britain that fit prior to 1911, and only one marriage of an Ada PARKES near Blackburn which was the 1928 marriage of a much younger Ada PARKES.
And there are no deaths or burials of an Ada PARKES near Blackburn.
During 1929-31 an Ada May PARKES was living at 28 Park Avenue, Blackburn with up to four lodgers, but Ada was not called Ada May.
An Ada PARKES aged 27 left London for Sydney on 26 Mar 1913, but Ada would have been 26, and should have appeared in the 1911 census. And she wouldn't have left from London.