STOCKBRIDGE, Ga. — To hear Mikia Hutchings speak, one must lean in close, as her voice barely rises above a whisper. In report cards, her teachers describe her as “very focused,” someone who follows the rules and stays on task. So it was a surprise for her grandmother when Mikia, 12, and a friend got into trouble for writing graffiti on the walls of a gym bathroom at Dutchtown Middle School in Henry County last year.

Even more of a surprise was the penalty after her family disputed the role she was accused of playing in the vandalism and said it could not pay about $100 in restitution. While both students were suspended from school for a few days, Mikia had to face a school disciplinary hearing and, a few weeks later, a visit by a uniformed officer from the local Sheriff’s Department, who served her grandmother with papers accusing Mikia of a trespassing misdemeanor and, potentially, a felony.

As part of an agreement with the state to have the charges dismissed in juvenile court, Mikia admitted to the allegations of criminal trespassing. Mikia, who is African-American, spent her summer on probation, under a 7 p.m. curfew, and had to complete 16 hours of community service in addition to writing an apology letter to a student whose sneakers were defaced in the incident.

Her friend, who is white, was let go after her parents paid restitution.

For all the attention placed on problems that black boys face in terms of school discipline and criminal justice, there is increasing focus on the way those issues affect black girls as well.