DreamingTheSeas: No offense is taken (you aren't so bad, anyway). Worrying does make you a little more careful, but only a certain amount of worry is necessary to achieve that effect. After that amount, too much worry becomes destructive. Life doesn't make this easy for anyone, especially when we're talking about children. Do everything you can for your daughter's sake and then just relax and be happy with her. That's the absolute best thing you can do.
Also, Jupiter is called the greater benefic for a reason. It won't start nor exaggerate any illnesses unless they will somehow become beneficial. Additionally, the 8th house is the house of death/rebirth, but it's also the house of goods belonging to others, committed relationships, and mind-expanding experiences. Perhaps this solar return marks the beginning of a development cycle for her?