My son also had severe food and enviromental allergies and allergic to all antibiotics so I know what you are going through. Please check out websites for asthma as they have a lot of good info that will be useful to you. Room air cleaners are really great, your child should have one in her room running 24hrs a day. There are covers for mattresses and pillows. Suggest that your relative get an air cleaner for when you go over, call ahead so they can start it before you get there. Try a nettie pot, you fill it with warm salt water to cleanse the nose. She is old enough for this, it helped mine and he was younger. Marilyn