Gluten Free Shampoo for kids??

My 3 year old daughter was diagnosed with celiac disease in May. We are trying to go 100% gluten free in our home. We have obviously been eating/ drinking gluten free, but since there is gluten in just about everything it's sometimes hard to find things that are. Our dish soap (seventh generation) says gluten free on the bottle. I haven't had much luck trying to find a gluten free shampoo for her.

Does anyone have suggestions for a gluten free shampoo I can just pick up at walmart/costco. I don't shop online.

Also, if I find a gluten free shampoo that isn't for kids, is it still ok to use in her hair?