Can't really see a 17 year old girl emigrating from the US to NZ all by herself.
https://www.bdmhistoricalrecords.dia.govt.nz/ - there is a Carl Frederick Wagner, parents John and Margaret, who was born in 1879
- he may have died in 1886, "Frederick Carl" - a John aged 46 died the same year.
paperspast.natlib.govt.nz - shows him in 1886 if you search for "Margaret Wagner" - listed as their only son. Resident Rangiora. He died September and John, husband of Margaret Wagner, of Rangiora, died November (drowned). The inquest was reported: it describes him as leaving a "wife and two little girls"
Papers past also shows a marriage in 1900 for Honora, "Nora", "youngest daughter of the late J. Wagner, Rangiora", and some school mentions of a Mary Ann Wagner who was at a Catholic school there in 1888/9
https://www.familysearch.org/ has NZ immigration lists.
Arriving on the ship Wanganui, in 1878, and listed as from Kerry:
John Wagner, farm labourer, 35
Marg???, 34
Mary, 2
Honora (Honoria?), 1 month
I wonder if possibly they (or John? - Margaret may have been already there) travelled to US, didn't like it, went back to Ireland, and then thought they'd have a go at NZ?
Nora had at least two children with her husband, Cornelius Allen, but he was in trouble with the law in the early 1900s (drunkeness, theft), before dying suddenly at the age of 37 in 1912.
NZ Archways shows a divorce case in 1905 for Nora and Cornelius - can't work out where she and the kids went from there.
