Just an FYI and so with it what you wish. Sometimes an RI will cause damage that is not repairable. Ut makes the animal more susceptible to illness in the future. You can look at it like a child with asthma or a dog with flea allergies. It is there to stay and will reoccur occasionally with little fluctuation in things that can sometimes be unavoidable such as pollen in the air, a stressful day or a gulp of water down the wrong pipe. a comprised immune system will always rear its dirty head. I think you are doing everything for your animal and do not see any husbandry issues. Your girl may just need a little more care then the average bear.