First get her PH tested. Her system may have become too acidic when long-tem use of Antibiotics disturb the health intestinal flora..
Consider the possibility of candida overgrowth and parasite issue, they overproduce when the bowel flora is not balanced. Get her on a cleansing diet..and cut out all the processed food and especially the sweets. Add mild antifungals (coconut oil, garlic, onion, thyme, oregano, etc..) and lots of natural probiotics to her diet (homemade kefir and yogurt from organic goat milk). Cow's milk increases acidity in the body, however goat milk helps establish a health PH balance. Add healthy raw organic fruit and vegetables to her diet: carrots, avocados, spinach, cucumbers, broccoli, etc.. Make her smoothies using homemade kefir and fruits.. It's a great way to make her consume kefir, the greatest probiotic..
Topically oil of oregano may help a lot. Get a high quality one like from North American Herb&Spice, from your health food store.
It took me 1.5 years to learn the right way to beat my chronic eczema. (I had large patches almost 9 years old..) Antibiotics and birth control pills were the main reasons for appearance of my eczema too...