Any of the bikes stated would be great. How tall is she? The F2 has a lower seat height than the F3/F4 because of the suspension, and is lower than the ex500.
If she has self control (which must not be an issue, because she is considering the 500 along with the F2) she should be fine with the F2's power, just be nice with the power. But you don't have to be paranoid.
(FYI- I don't figure you have to worry much about looping a F2, I was purposly trying to power wheelie my F3 and could never get it off the ground more than an inch without popping the clutch. No matter how fast you whack it to WFO! So on the side of wheelies=bad, yet on the side of accidental looping=great.)
There's alot to grow into and learn no matter which bike you choose, its a personal choice. I am in agreement with the MSF course, the more you can learn, practice etc... the better. Thats what soo cool about this sport, you can never know it all, or be the best... There is always something more you can learn, work on, polish and get better at. Challenges in life are a good thing! (Other wise we'd be out riding cruisers if we wanted to poke along, relaxing, working at 30%, following the exact speed limit and traffic flow!
The grip on the right is the Fun control (or something like that, I read it in Twist of the Wrist)