Mel - it depends on the game you're going to be hunting with her.
Mine wasn't the least interested until later on in her late teens, so I built her a .260 Rem on a 1950 FN Mauser action. She loves the rifle and shoots it as a champ - she had never fired a rimfire before and only a few rounds of .22 Hornet prior.
Although I'd have preferred to hunt with her from early on, it just doesn't happen - but later is much preferred to never - I enjoy hunting with her so much, I've decided not go to guiding camp this year, preferring to hunt with her instead.