Lovise Marie Theresa WAHL b. 1872

I am trying to find the baptism record for the above. Father: Friederich Heinrich Oswald WAHL. Born ca. 1830, Prussia. Mother: Gunild PAULSDATTER. Born 18 Feb 1834, Trøgstad, Østfold, Norway. I have some conflicting information about her birth: Born 01 Apr 1872 or 18 Apr 1872, Kristiania or Mysen, Østfold, Norway Emigrated 31 May 1872 from Kristiania (now Oslo), Norway, aboard SS "Høvding". Arrived 01 Sep 1872, Napier, Hawkes Bay, New Zealand. WAHL Fredrik, 42, Farm Labourer Baker WAHL Gunhild, 37 WAHL Wilhelm, 9 WAHL Louise, 2/12 I would be grateful for any assistance.