June 1966 Waitomo Caves Area

I am looking for my mother's daughter. My mothers's name was Patricia Mayne and she had a daughter in June 1966 in the Waitomo Caves area. The family that adopted her already had an adopted son. I believe Mum called her Angeline but I don't know if the name was kept. I hope someone out there knows something about her.thanks for readingVanessa Flint, Rockhampton, Queensland, Australia