it sounds to me like she needs to see an allergist to find out what she is allergic to, they will do a test called a RAST test. this test will check her immune response against everything imaginable to see if she is allergic to it. it is just a simple blood test. But something you can do is check your home for mold. I already know that my allergies are to NSAIDS, penicillin (which is made from mold), mold, cats and dogs. So i am pretty sure, since mold spores release in spring and fall, my eye swelling was the result of airbourne contact to mold spores. i unfortunately am not able to find any mold in my home so i need to pay an expert to come out here and find it, since i know it is here. in my opinion based on the dates you have posted your question comments, mold spores are most likely the culprit. however, to be on the safe side, i would most definately get the rast test done. she will thank you in the long run. hope this is helpful.
Dry eye (keratoconjunctivitis sicca) is a common condition caused by decreased tear production or poor tear quality. It is associated with increased age, female sex, medications (., anticholinergics), and some medical conditions. 29 Diagnosis is based on clinical presentation and diagnostic tests. Tear osmolarity is the best single diagnostic test for dry eye. 30 , 31 The overall accuracy of the diagnosis increases when tear osmolarity is combined with assessment of tear turnover rate and evaporation. Some patients with dry eye may have ocular discomfort without tear film abnormality on examination. In these patients, treatment for dry eye can be initiated based on signs and symptoms. If Sjögren syndrome is suspected, testing for autoantibodies should be performed.