Diapers drama


My mother in law wants to use some coupons to buy us diapers. Huggies, luvs, pampers etc. she's an ANGEL and I adore her and listen, I'm not one to turn away help. But I feel strong about using a les toxic brand and I'm my sure how to tell her. Do I just let it slide and let her do her thing? Or stick to my gut and be honest with her??