Thanks for the feedback. It appears that US rules do suggest that the ref was correct while FIFA rules (which don't apply in this case) allow them to be worn as I had described.
The ref's reasoning for this ruling was that another player's foot might get caught on the edge of the shinguard if it shifted below the sock or came lose. For that to have happened, however, I think my daughter's foot would have to have come off since these shinguards are the type with a stirrup and ankle pads. The lower part of that shin guard is not going anywhere and the top was several inches inside the sock.
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