Hi Jessica!
I think this completely varies. Our bodies change as we get older too, and sometimes what we think works or doesn't work when we're young, might work as we get a bit older. For example, I took pulmozyme as soon as it was fda approved (I was probably around 12), and thought it did nothing, so I stopped it. I gave it another go around age 18 and have been doing it since because I really think it helps. Of course, this might have something to do with the fact I'm more congested now than I was back then so it's a more notice-able change now!
The other thing to keep in mind is sometimes it's confusing - we're on so many things at the same time, it's hard to tell what makes a difference and what doesn't... especially since sometimes we just have a coincidental "good" or "bad" year!!
That being said, I think the early you incorporate her being a "partner" in her health care the better. From a young age, I was better with the Adult CF model of care -- where the doctor listens to me as much as I listen to him, then the Pediatric model, where you get told what to do. I'm less likely to rebel if I'm a part of the decision!! <img src="i/expressions/face-icon-small-smile.gif" border="0">
Kris
26 w/ CF