She was quite likely a member of New Zealand Warbirds.
She may have flown vintage aircraft and may possibly have learnt aeros and formation flying.
I'm pretty sure she NEVER EVER flew as display pilot especially with NZ Warbirds.
I attended many of their airshows during the time frame she claims to have been involved and I can remember many of the display pilots names from that era and I'm pretty sure I'd remember her name if she was one of them.
I suspect Canopener will be your best source of information from this part of the world