She can come on the back, not problem, but the CBR600 isn't know for pillion comfort!

If you want to ride it, we know have a graduated licensing system, so young tearaways can't get straight on a litre sports bike! I think you have to do your time on lowered powered bikes first. The silly thing is that the insurance premiums largely prohibit inexperienced riders on big bikes anyway. Fortunately, I passed my test before they moved the goalposts.