She may now be a big fan of Chicago's Cubs, but de Boer is still an enthusiastic preacher of the gospel of rugby.
"Several of my oldest friends have started playing rugby," she says. "It's an emerging sport here.
"There's an English guy here running a youth programme called the Barbarians. They always talk to me because they know I'm so enthusiastic."
De Boer moved to the US with her mother, stepfather and sister after finishing high school in 1985. She intended to treat it like a gap year, but that didn't quite pan out.
The rest of her family, including father Geoff, live back in New Zealand and while she visits regularly, this weekend she's excited about getting a chance to play host to any expat who might want to ask her the best places to eat and drink in the sprawling megatropolis that is Chicago.
That has been the success of this concept and why the magnificent Soldier Field will be full to bursting. As a sporting contest it's easy to write it off - nobody expects the US to get close including, it seems, the All Blacks' selectors who have named a second-string starting XV - but as an "event" it is hard to dismiss.
New Zealanders are descending on Chicago from all over the States and beyond. It is a chance to see their favourite team in a destination they would never have considered possible.
If a few thousand Americans get converted to rugby along the way, great. If not, no worries. Expats like Kim de Boer and her coach-load of mates, and the hundreds of New Zealanders who have flown in for the week, will still have a ball.