We considered this together and it comes down to a few things. First, remove all contaminants from your home and if anyone MUST have wheat, give them a separate cupboard and make sure they know exactly now to not cross contaminate. I had to learn this after much repetition. When I make a sandwich on wheat bread, I use about 2x the dishes (spoons etc) than I did before and I wash my hands about a half dozen times.
For others, explain glitter. It gets everywhere. The only way to not get glitter on yourself is to go where there is no glitter. Tell them to imagine that their hands, utensils, pans, etc are covered in glitter. Until it's been washed by something that's glitter free, then whatever touches it will have glitter on it. Except this glitter can kill.
Regarding finding a place to eat, be careful- there's places that have gluten free items, but pay no attention to cross contamination, and then there are places that simply ARE gluten free and have no gluten. The main question to ask: "Do you have a separate preparation and cooking area for gluten free food?" If the answer is no, move on. Call ahead, and plan you excursions based on these areas. It's also very hard.
This app helps her find a place to eat: https://www.findmeglutenfree.com/
My wife mentioned something else: Let your friends and family know that Flour, Wheat, and Gluten are the same thing. You need to be an expert on what has gluten in it. If you go to a restaurant, you can ask to see ingredient lists, and it's up to YOU to determine if there is wheat. Most food industry people are not trained in this. We once asked if food had gluten in it and got a "No" after they looked at the ingredients. When we examined them ourselves, it plainly said "flour" on it. Flour, unless specified to be GF, is wheat.
All of this research can be done online. Be the expert, and save yourself time and frustration. Also, be bold! If you get a 'rolleyes' from a server when you ask about GF food, that's a good sign to just walk out. Unfortunately there are many for whom GF is a fad and they treat it like it makes them cooler than everybody else. They have done a lot of damage for Celiacs, but don't be afraid to set yourself apart from them. "I know it might seem difficult, but if I my daughter gets gluten, she goes into anaphylactic shock, has to epi pen herself and then spend the night in the ER. She could die."
My daughter sometimes sets her epi pen next to her! One server brought her a salad with croutons on it- when my daughter explained the problem, she simply picked the croutons off and brought it back! My daughter decided to get her epi pen out and show her how to use it so that when she started dying, she could epi pen her. That straightened things up quick!
Best wishes to you and your family!