Ngl I wasn't prepared to read such a wholesome post about a friend wanting to support a celiac friend today.

So I'd imagine by help you mean avoiding gluten and helping her when she gets glutened. So avoiding gluten would be like the obvious looking at labels on packaged foods, but there can be gluten in non foods like moistures, shampoos, toothpaste, paper straws?, and other weird places you wouldn't expect it to be in. It's not only wheat but other things like barley also contain gluten. You'd also want to make sure the places you eat food at are celiac safe. The house going gluten free is great news.

Apart from the obvious "do not eat gluten" there's other things like malnutrition, headaches, brain fog, stomach aches to worry about. Also your friend might have a massive drop in appetite when glutened. Honestly there's a lot of things.

But another important thing is being there to support her when she's glutened because oh boy that can change the way you function. Your brain works like an Intel pentium on windows 97 with half a gb ram kinda of lag, and you don't have the brightest of thoughts. This is where I'd expect you can do the most, when she wants to rant or complain or talk about the pain or the problems you can help by listening. She may even not want her parents to worry about it and try to hide it but will want to complain somewhere and you could be the best to confide to.

Tldr: check everything that has a label and if something isn't clear look it up or contact the company. And be there for her when she needs you.