She didn't get penalized because the play you describe is legitimately an error. Had the fielder not committed the error, your daughter would have ended up with a single anyway. The fact that in this play she ended up on 2nd had nothing to do with her hit, but rather with the error.How do you figure she didn't get penalized? Sure, her average stays the same, but every other advance metric took a loss. Slugging percentage, OPS, etc...