pitching rules

[SeaDude]

My daughters played a High School game yesterday and had the opposing pitcher make a noise after the pitch reached the plate. I noticed her doing it in warm ups. The coaches didn't say anything (whole diff. problem there), but I did. The Umpire said that if she did it consistantly as part of her release then he didn't see a problem with it unless the other umpire did. Her coach said she has always done it and it was part of her release. Fact is, she did not do it consistantly through out the game and it was much later then the release. It was noticed in the student section which brought complaint and eventually grunts from them during her release. I believe it is shows unsporting behavior by a player, but I can't actually find a definition of "unsporting". Can anyone direct me?

Thanks