Sport bike for shorties?

[serp16]

My wife would really like a sport bike. Unfortunately we cannot find one short enough for her. She is 5'-4". We tried sitting her on a Ninja 650 this weekend and she came up well 3" to 4" too short. I have read that the 250 is less than an inch different than the 650, so even with a lowering kit and lower seat, it still likely won't be low enough. Do you guys have any advice? I would hate to modify a bike and compromise safety/rideability...but I would also hate to make her ride a cruiser too.....

Thanks