"From a young age I wanted to be a Black Fern. One of them came to do a talk at school [in Kawakawa] and I was really inspired. Mum wouldn't let me play at first, but then I ran rings around the boys. It's all fallen into place."
Vaughan is the prototype of the modern women's rugby athlete, well conditioned and multi-skilled. Two netballers - Charmaine Smith and Keri Hayden - have also cracked this squad.
So what position will she play in Canada?
"I don't really mind at this level, because you just want to get on the park, but I like it out wide with a bit of space to move."
Vaughan plays her club rugby for Kia Toa, with Winiata. There were five original selections from Manawatu, though Rebekah Tufaga succumbed to injury and Sita Kuruyabaki could not travel because of visa problems. Vaughan is ready.
"We've put in the work. It's now about doing those one-percenters."
The challenge ahead
Sunday: Black Ferns v Canada, 8.30am NZT
July 2: Black Ferns v England, 6am NZT
July 6: Black Ferns v USA, 6am NZT