Hi Dee,
I searched the NZ Birth Indexes 1921-1927 and found these:
1921 KING Gladys Christine, folio 1702 (registered at Invercargill, March qtr)
1925 KING Pamela Mavis, folio 1007 (registered at Wellington, March qtr)
1926 KING Pamela Mary, folio 4912 (registered at Christchurch, Sept qtr)
Regards, riley