If I understand what you are saying, the coach was arguing that the runner veered too far into the infield in the first half of the base path, not that she ran out of the running lane in the last half.
The BR is not required to run in a direct route to anywhere unless an attempted tag is being made on her. In addition, she is required to stay clear of any fielders attempting to field the batted ball.
Unless you judged that the BR was running into the infield to intentionally interfere, there is no infraction here that I can see.
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Tom
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