As the issue progresses the clutch pulls more so it sounds like the problem We had. It went from normally working through the kind you specified your wife has to being unable to stop without turning of the engine, all in 2 km in my case. And from what I hear every evolution of the problem is different from bike to bike. If I were you I’d ask them to change it in your bike too unless they’re sure that you’ve got the updated piston fitted. I’ve got one of the first production models and AFAIK every bike my dealer sold showed up for repair. 🙂
Hope they’ll fix it soon for you!