It’s so tough to go through this. She might try finding an allergist/immunologist who specializes in these cases. They put a bunch of patches on your back with different potential irritants for 5 days and see what happens. New carpets, sofas, cabinets (and apparently coffee pods- I had no idea 🥹) can all off-gas. The list is endless so it’s trial and error. Took me years to figure it out and new ones still pop up. Good luck!