I think you are crazy to play P or 3B without one. The rest of positions are up to players. I think that the stigma is really going away. If you DD want to wear one absolutely tell her to keep wearing. DD never wore one except some times playing C and played a lot of 1B. I got her one and encouraged her but she just didn't. I did once see a P in 14U get hit in the face with a line drive and never have forgotten the sound.