I have just found out via a PM the Louise has been using the fingers of her right hand, which stick out from the sling, to hold things. That sounds a bit like cheating to me!
As she clearly can't be trusted to follow the rules I think the fingers should be taped with physio tape or similar to keep the fingers and thumb immobile and held close together. By the looks of the photo here:
https://www.amazon.co.uk/Medical-Sho.../dp/B071RY8Y3F
If the hand was in a fist it would be completely covered by the sling and therefore the tape would be hidden.