The Tempus Award, now in its fifth year, recognises outstanding achievement by an Old Girl in her field.
Previous recipients have included New Zealand actress, Dame Kate Harcourt and co-founder of Trade Aid, Vi Cottrell.
Presented by the Woodford House Old Girls' Association, McKinnon was recognised with the award at a special event held in her honour earlier this month.
The event was attended by Old Girls, including friends from Avenal's time at Woodford House, members of the Old Girls' Association, Head Prefect Georgia Trent and principal Julie Peterson.
McKinnon was also joined by husband John, daughter Sophie and son Alex, along with his wife Rhiannon and their three children Madeleine, Elizabeth and Percy.
Invited guests enjoyed the opportunity to hear about Ms McKinnon's time at Woodford House which she attended from 1962 to 1966, one of only 14 girls who travelled from the South Island by boat.
Art has always been an absorbing interest to McKinnon, but she was initially inspired by the work of Frances Hodgkins through the painting titled La Première Communion, which hung in the Woodford House dining room, when she was a boarder.
"At our assigned tables, we would move around one place at every meal, and I always loved coming close to this beautiful work and actually sitting beside it on various occasions."
In a touching tribute to her time at Woodford House, McKinnon presented a very special painting to the school.
The artwork by Frances Hodgkins reimagines the original oil painting The Tyrant by Marie Seymour Lucas in watercolour.