As long as she is coming back up into the 90s that's great news! If you can get the infections managed through diet, exercise and being somewhat proactive you can prevent a lot of damage from being done in the future. Because her lungs still appear to be in great shape it might be who of you to look into having her do lung expanding exercises to help the lungs to grow while she is still in her years where they are able to grow. The lungs are made up mainly of zinc, protein, and vitamin C, these create elastics (spelling?) tissues and well as collagenic tissue. It's also known that Retinoic Acid or RA is also a main component of lung repair mechanism in the body. Also note that RA is a derivative or Vitamin A. Apple are the holy grail of of fruit to support lung function and repair of the lung tissues. Foods that have high amounts of RA in them are Sweet potatoes, kale, spinach, cayenne pepper, bell peppers, carrots tomatoes and green beans. I'm not sure if you find this information helpful but someone might. You must be careful not to over-dose on Vitamin A though as it can be toxic.