It is caused by a temporary breakdown that interrupts the blood flow to the brain or nerves. The result from the spinal cord fluid scan indicates that she is normal. I would insist on regular checking where she can have enough rest, as it is key to her recovery. Typically, the body heals itself after some time, so in most cases, the paralysis will disappear. If, after all this period, she still experiences these symptoms or possibly worsens, then much stress is seen to be caused, and the situation demands continuous communication with her neurologist for safety.