Should I tell my mum's priest that she can't sew anymore?

My mother (83) has always been her local church's seamstress. Over 40 years ago she made the altar cloths and gowns. She has continued to do this over the years. About 5 years ago, the then priest asked her again. She really struggled as her eyesight was poor and she couldn't sew in a straight line. We, as a family, never ask her to undertake any sewing tasks and haven't for about 20 years. The church has a new priest and he has asked her to sew the altar cloths again. She cannot say no but she is really struggling. Her eyesight is even worse, she can't remember measurements, the task is too much. I was thinking of emailing the priest and telling him the task is too much for her. Any thoughts would be greatly appreciated. I just wanted to add that she doesn't want to do it anymore but cannot say no. She also isn't paid.