Marriage certificate will confirm her parents and place of birth NZ certs have both parents named.
Buy the Print out, cheaper and has more info.
Birth cert of children should also confirm place of birth
From 1880 – Marriage Act 1880 (Dated 17 January 1880)
Local number
Bride and Groom
When and where married
Name and surname of the parties
Ages
Rank or profession
Condition of parties
Bachelor or spinster (or as case may be)
If widow or widower date of death of former wife or husband
Birthplace
Residence: Present, Usual
Parents
Father's name and surname
Father's rank or profession
Mothers name and Maiden surname
Signatures
Bride and groom
Witnesses
Officiating minister (or Registrar)