A private school in Texas has been sued for more than $3 million by the family of a black girl who accused three white classmates of wrapping a rope around her neck and dragging her to the ground during a school trip — leaving her with severe rope burns and a mark that looked like a necklace.

Lawyers for the girl, who is identified in court papers filed on Monday only as K.P., said evidence suggested that race played a role in the episode, which occurred during an overnight outing in April by students from the Live Oak Classical School in Waco. The girl was 12 at the time.

But while lawyers for the girl and the school agree that something happened to the student, they disagree about virtually everything else — whether what occurred had been a deliberate act, the severity of her injuries, who was to blame and if race was a motivation.

The girl’s mother, Sandy Rougely, said in an interview on Thursday that she thought her daughter was wearing a necklace when she first saw her after the trip. She said when she learned that the marks had been caused by a rope, “that just tore me into pieces.”

