Bailey Agnello, a former honor student and standout volleyball player, pleaded no contest to a felony assault charge in October after Judge Paul Burdick indicated he would sentence her to no more than 180 days in County Jail.
Friday, Burdick imposed a one-year suspended jail sentence and told Agnello she would be jailed if she violates probation, prosecutor Rebekah Young said.
Burdick also ordered Agnello to complete 400 community service hours, Young said.
Agnello was arrested after she and a 17-year-old fought with a 15-year-old early on Feb. 18, Santa Cruz County sheriff's deputies said.
The victim's injury required 11 stitches, and she will need scar revision surgery, Young said. Agnello was ordered Friday to pay restitution to cover the victim's medical expenses, she said.
The victim's mom stated in an email message that Agnello apologized to her daughter Friday and seemed sincere. She said she thought the sentence was appropriate. But Agnello's friend, who was prosecuted as a juvenile, had bullied her daughter for months and received "no consequences," she said.
The victim and her mom spoke at the sentencing hearing.
Agnello's attorney, Paul Meltzer, said earlier that Agnello entered a rehabilitation program in Southern California after her arrest.
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Editor's note: The amount of community service Agnello was ordered to perform was incorrect in an earlier version of this article. This version has been updated to state that she was ordered to perform 400 hours of community service.