Ya think? I have shared with her all of these details, about the club foot, the lameness years ago, the back soreness, she knows how valuable the horse is to my livelihood. I just haven't suggested that she might weigh too much. I suppose I could offer for her to help. She says she has been dieting for quite some time now. She has cut all sugar out of her diet, no caffeine, no drugs, doesn't ever drink.
The horse doesn't care if she's cutting sugar out of her diet. The horse is going to care about a sore back.
Be honest and don't let her make excuses. If I was too heavy to ride a horse I would never try to weasel my way on their backs!