Give her .. her own stash ( in a seperate area or box) that she can cut and sew at will, but anything else she needs to ask permision first. Thats how my Mom managed with four sewing girls in the house. Touching Mom's stash was a HUGE No No .. but we had our own smaller stash and periodically she would give us an allowance to add to our own , and she would sometimes de-stash and have an auction amoungst us girls.