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Yes, this is a problem I have experienced. It was a total pain in the ass. First, let me state that I am a nursing student and don't claim to be a total authority on the central/peripheral nervous system, but when I was hurt I did ask some doctor friends and my professors about it. What she is experiencing is called Foot Drop, with it extending up her leg. What I suspect I did, and she has done, is damage the common fibular nerve, AKA the peroneal nerve. This is a lower branch of the Sciatic nerve which is the largest nerve that supplies the lower limb. The peroneal nerve inervates the knee, lateral calf, muscles of the anterolateral leg, and the foot. If she injured this she will be experiencing everything you mentioned. I did it when I didn't have time to stretch real well one evening before boating. Another thought I had was my padding was compressing the nerve somehow. I couldn't get in my playboat for a few months without it going numb. I ended up only paddling a boat that I could get my legs out of the thigh braces from time to time to wake up my leg. She will need to let it heal. I wouldn't get back in a boat until she feels 100%. Then she should pay close attention to when her leg is falling asleep and get out fast. Don't let it go totally numb. Again, she needs to let it heal. This happened to me last year and after being real careful with it, I think its all good. But I always stretch and the second it starts getting numb, I get out and walk around. Thankfully it doesn't happen very often.
Hope this helps.
BTW, I never changed anything in my boats.
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