That's completely the wrong sprocket for the bike. Even a stock size will not fit the FZ6R.
Check this one out:
Driven 520 Steel Rear Sprocket for FZ6R 09-13 - SoloMotoParts.com
Not defending her, but same thing happened to me a while back and I tried analyzing what I did wrong and how to prevent it from happening again.
I realized that our bikes get completely hidden by the B-pillar of cars so it's possible she checked her blind spot and mirrors and actually didn't...
Look into the Race Tech springs that are matched to your weight. You can also add their cartridge emulators for increased adjustability.
The stock springs are progressive and you go through the first little bit of travel really quick!