you guys have come up with some incredible info, here!
i've applied for a birth certificate with the NZ BDM.. and apparently if she was adopted, that's ok, because they can come up with a pre-adoption cert as well.
I indeed have the marriage certificate for Fred & Rosetta... it lists Rosetta's parents as Leander Johnson (dec) and Sarah Annie Waggon. Though i'm 110% certain that i've seen her Death Cert as well (it's managed to go missing) and her mother was listed as Sarah Annie Wagner.
Rosetta's Death Cert also states that she was Born in Auckland, NZ. Which lends more weight to the theory that she may have been adopted if indeed Leander & Sarah came over from the UK.
I spoke to my nan again today, and she says 'the whole family was involved in shipping in Dora Creek' so I'm thinking this family may just be the right one. However, how everyone ties in together is another issue.
just a few more things to think about