Sounds something like our little girl - she gets extremely nervous just when she gets ready to go to the ring, too. And when she gets nervous, she gets nauseous, and then... Well, you can guess the rest. But once she's in there, she's all business, and she'll come out smiling everytime.
We did eventually learn that our oldest, who has ADD, could focus much much better in the ring if he took his meds an hour or so before he showed. He normally only took them before school, but his doctor saw him show and suggested we try it - it did seem to help, but he doesn't use it anymore (anytime).