Quick question: your collecting has beeng going on for six months, but only now she's reacting? Are you absolutely sure she's not having seasonal allergies?
Ok, I know it's unlikely, but had to try. This happened to me, by the way. I suddenly got really sniffly and sneezy a few years ago and thought it had to be something in the house. Changed laundry detergents, soaps, everything, and then eventually found out I had hay fever. First time in my whole life.
Good luck finding the culprit, and hopefully you find some fragrances you can wear!