So, your girl wants to ride huh? That's cool! Congrats!
So, your girl's VERY accident prone, not cool. Sorry to hear that. j/k
#1 Try and find her a 250 (in my MSF course they had a 250 Ninja)
#2 NO bike until she takes, and PASSES an MSF course.... stick to that rule.. NO MATTER HOW MUCH SEX SHE PROMISES. LOL
#3 IF you are that scared for her safety (she's a lucky gal) then might I suggest NO RIDING UNLESS FULLY GEARED. helmet, boots, gloves, leather jacket, leather riding pants.... This way if she were to go down at least her skin is protected.
#4 Talk to her about all YOUR concerns about her riding. Try not to "attack" her driving skills, but explain that a bike is NOT a car and if she's not 100 % dedicated to learning and then riding RESPONSIBLY then she could very well lose her life (and tell her it would kill you if that happened to her with a BIG hug. It should help her to realize that you are doing all of this for her safety)
NO matter what, AND I MEAN THIS (from personal experience) DO NOT make her feel like you don't want her to ride because she is a girl!!!!!!!!! You must pick all of your words carefully, because if something is said the wrong way, she might think that "you don't want her to ride because she's a girl and girls shouldn't ride sportbikes" Yes, this is what happened between my b/f and I a few years ago. after a HUGE fight he finally explained better what he was trying to say and then he paid for my bike!
Good luck buddy! Hopefully some of this helped.
~Camarogrl