Her longevity in the role is remarkable in itself given the more demanding nature of the international calendar and the higher profile the sport has in the media.
But arguably, her greatest achievement in the role has been her ability to grow and move the game into a truly professional era.
It was considered a bold decision by the Netball New Zealand administration of the time to appoint the relatively unheard-of Aitken to the top job. But her plans for the national programme were even bolder.
When she took over in 2001, the Silver Ferns were streets behind Australia in terms of their fitness, physical conditioning and general approach to the sport.
Within the space of 18 months, Aitken had bridged that gap, leading the Ferns to a world title.
Not only did she manage to catch Australia, but over the ensuing years she has ensured the Ferns have been able to continue to keep pace with the world-class Australian programme.
Each has enjoyed solid periods of dominance - the Ferns in 2004-2005, Australia in late 2006-2007 - but the two teams are pretty much now on level pegging.
In fact, since September 2009 the wins between the two have alternated every game.
Having achieved such equality, New Zealand fans now expect the Silver Ferns to beat Australia. And that should be Aitken's lasting legacy.