have you considered adding marshmallow root to her protocol? Myself, I prepare both slippery elm and marshmallow root as decoctions (simmer on low heat for 10-15 minutes, covered. remove from heat & keep covered until the steam returns to the decoction) because our tradition says that the medicine is best released. To store the extra, put in a glass jar and refrigerate without straining. MR is excellent for bladder and lungs, very soothing. You can also ask your vet or a holistic vet about adding elderberry. You can also ask your vet about tumeric extract because it helps reduce inflammation - I have seen it recommended for ibs and for stomatitis.