Yay for your daughter! Yes, not all syndets use lyes, some use other harsher chemicals to create them. SLS is show to have toxicity at .5 grams. Which is why you aren’t supposed to swallow toothpaste and why you are supposed to not get shampoo in your eyes. This is all readily available in public databases, including results from testing. I have a relative who doesn’t use any cleaning products, soaps, detergents, deodorants, shampoos, unless she’s positive it does not have chemicals in it. Much of the stuff she ends up using has more chemicals than anything normal out there. She probably wouldn’t drink water from her faucet if she knew it had chlorine and flouride in it from public water treatment plants. We don’t try to educate her, she ends up isolating herself more if we do. Even if I tried to convince her my unscented soap has no fragrance, she wouldn’t trust me because the soap smells like soap, I somehow put fragrance in it. Like your customer, she’s always right.