Look through some of the disabilty products there are a ton of things (I dont know if any would help her) but lots of interesting products like push button shifting, i forget how the system works exactly though. a couple sites i just found : http://www.mtb-amputee.com/motorcycleamputee.htm http://www.disabledmotorcyclerider.com/klever.html Only reason I know of that is from a guy i worked with that rode a training wheeled harley that was paralized waste down so couldnt shift and had an actuator shift the bike off a push button setup.
Depending on your wife's desire to ride she can always get a bigger bike to. The guy i used to work with had I think a Road king. It had reverse and an actuator based shifter. His bike was set up with what looked like training wheels but each arm that came off for the wheels had a mini platform so he could fold his wheelchair and roll it onto the platform then fasten a strap to hold it in place for while he was riding. His front and rear brakes i think were linked too.
Figure out how much relief the clutch relief's have for different bikes and she may be able to just get that. If her right hand is good she could check out the K-levers and get one that works clutch and front brake.
no.ridley is still rocking and rolling.
