The lawsuit, which was filed in 2016, said the episode occurred at a swing that was hanging from a tree and had a separate rope used to pull it higher. The girl said she was standing to the side when she felt the rope pulled around her neck, violently jerking her to the ground.

The girl said her classmates had bullied her before the school trip, according to the lawsuit.

The family’s lawyer, Levi G. McCathern II, said that he saw race as playing a role in the school’s failure to notify the girl’s parents after the episode. “If it had been a little white girl they would have been on the phone with her mother within the hour,” he said on Thursday.

David N. Deaconson, the lawyer for the school, rejected the assertion that the girl’s injury was a result of bullying and that the school’s response had anything to do with race. He said the school recognized that it erred in failing to call the girl’s mother after her daughter was injured and in not having a chaperone with the children playing at the swing.

Mr. Deaconson has described the scene this way: Several children were pulling on the rope to raise the swing into the air, he said, and when they let go, the rope whipped past the girl and hit her in the neck.

On Wednesday, the jury for the court in Travis County ordered the school to pay $55,000 for the girl’s physical pain and mental anguish, $10,000 for disfigurement sustained during the episode and $3,000 for medical expenses. The verdict was not unanimous; one juror disagreed, but the court documents did not say why.