Well, numbness and tingling are generally considered red flags and I would suggest that she go visit her doctor. But you did that already. From what you have shared it seems she has clearance from her physician. If it is not documented I would insist that she bring in a medical release or you contact her physician directly.
The fact that you’ve shared it with the Fitness Connect environment indicates that is is concerning to you. It might be a good idea to get her to get a professional opinion.