dealing with adrenalin without...

Depending on the sport on question, that may not be an option.

I get a very similar feeling when I go extreme. But instead of barfing I bowels become unfriendly for the next three days. But that is only when limits are broken.

If you find a cure, let me know.

Does it seem to be only in races?  I'm wondering if it's more from nervousness or if there's another reason.  I can eat anything before a training session, but sometimes before a race I just can't seem to digest my normal breakfast, the same thing I have every day.  Especially milk, it doesn't want to sit right in my stomach and it feels like it's due to pre-race jitters and anticipation.  If that's the case, maybe you can do some experimentation with what she eats before a race.

That happens to me, too. It first started when I was a swimmer in high school. I used to throw up before every meet because I was so nervous, thinking I was going to fail, etc. I never found a way to deal with it. In college, it started happening before exams, presentations, anything like that. I finally talked to my doctor, who thinks that they are basically panic attacks. I was taking medication (before school things) to make the feeling go away. Now, I'm trying relaxation techniques: slowing down my breathing, listening to music, tuning everyone out, and just trying to stay really positive before a race. I still get the nervous feeling in my stomach, but I've stopped throwing up.

I'm not saying that she's having panic attacks, but I wonder if she is feeling how I used to feel? Does she worry about doing poorly? That really contributed to the making me sick.

Oh, and to go along with what Max said, I'm really careful about what I eat before races.  I don't eat very much, never dairy.  That helps a lot, too. 

I'm just thinking that maybe her genetic makeup is leaning towards the slow-twitch muscular side and that she's cut out to perhaps be a long course athlete!  Maybe her body just rebels at the short, hard efforts.  As she gets older and builds up to longer distance racing, she may find that "energizer bunny" within her that allows her to just go and go.  We could be looking at the next Natascha Badmann here.  10 years from now we can look back and say we knew her when she was just starting out on BT!