If you practice 1/100th keeping quiet about the game as she does preparing for it, you'll do just fine Eat something instead, since it's rude to talk with your mouth full. Put the radio on and rock out.
-W
Since I had been there done that, I never had anxiety watching my kids pitch. Heck, they were prepared. They were talented and they were ready. I just sat and ate my popcorn. You want to act like the dad of the HS star quarterback and smile politely and tell everyone how great their girls did.
ps. tell her something Jennie Finch said, "Pitchers are so special that they're the only one on the field with a circle around them"