Point of playing a game, after a certain level, is to win I would agree that at the lower levels (maybe 14U and under) it would probably best for the development of the pitcher to let her pitch. I was thinking more along the lines of college softball/pro baseball (although in pro baseball I can only remember somebody intentionally walking somebody with the bases loaded once and that guy hit 72 HR that year I think..)
Yes, I remember Bonds being walked in that exact situation. I don't remember how many outs there were, but I know he was walked intentionally with the bases loaded.