I need some suggestions for my girl.

I know I know, go sit on a bunch and see what you like/what fits well.

EDIT : Summary version -
Don't know where to even start looking when it comes to smaller bikes. Seems like finding the right size bike is even more important, and even more tough, for someone smaller.
-she's about 5'5 <110 pounds
-likes the more aggressive stance (something like the 05 zx6rr) versus the more upright -stance (like the 08 fz6r)
-Needs to be decently lightweight.
-narrow frame
-still have enough go to be enjoyable, no 250's looking for a 600
-weekend warrior type riding
-suggestions for set-ups/mods are more than welcome as well.
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Problem is, I don't really know where to start.
I'm over 6 feet tall, 220 pounds, so I've never really looked at bikes from a smaller person.

She's about 5'5 and less than 110 pounds.

She's ridin some of my old bikes before, 08 fz6r, 06 zx10r, 2005 zx6rr.

The zx10r was just too much bike for her. It was pretty beastly. I loved it. Can't wait to get another.

She hated the fz6r (i did too) it was too much of a cruiser, because of the way the weight was distributed on the frame, it felt heavier than the zx10r. It was way too tall. Just not an awesome bike. Didn't feel like you could "get away" if traffic was being dumb. Not so much a problem with the weekend cruise, but for a daily ride that's a big point. We called this bike Betty as in Betty the cow, she was the sleekest, fastest, big fat cow.

The 05 zx6rr, she fit a lot better on. She didn't get much seat time on it to see how she liked it, but being a little bit smaller than the 636, she seemed to fit better on it. Even the 636 seemed like a big bike. I think with some tweaks, getting it set up more for her instead of my big ass, she would have really liked it.

"They" say that the 600 cbr would be a good option because it is so light. They also have said that a yahmaha would be the best because it is a smaller frame like the zx6rr, but has the torque of the bigger 636, which makes it easier for someone who doesn't ride all of the time. But you know how "they" like to run their mouths.

So far, from what I've put together, she likes the more aggressive stance of the sportbike, versus the more "upright" stance of a sport/cruiser (not really sure what to call that kind of bike, lol)
600 is more than enough.
She's not looking to race it or track it so it doesn't have to be blistering fast.
She also won't ride it everyday. She'll just ride with me on the weekends and what not, but I want her to feel comfortable none the less.

Doesn't have to be a brand new bike.
Not really looking for anything too much older than say 2005.
Ideally looking for that generation of bikes that was out from about 2005 to 2008 ish.

So, with all of that said, anyone have any suggestions?