A woman was remanded in custody on Thursday charged with the murder of a 13-year-old girl who was stabbed in a Doncaster park.

Hannah Bonser, 26, made a brief appearance at Doncaster Magistrates' Court over what police have called a "random, isolated attack" on Casey-Lyanne Kearney, 13, as the teenager walked to meet a friend.

Relatives of the victim listened in the public gallery, some sobbing, as the details of the case were outlined. Bonser, who has brown hair and a tattoo, nodded to confirm her name and date of birth and gave her address.

She listened as the murder charge was put to her, plus and a separate charge of possessing two knives. Bonser will next appear at Sheffield Crown Court on February 23.

The Times reported that she was known to social services agencies.

Kearney was found lying in Elmfield Park in Doncaster on Tuesday afternoon. She had managed to call 999 and a passer-by also called emergency services, but the girl died in hospital later that day.

Her parents said in a statement: "Losing Casey has been so painful words cannot begin to explain.

"She was the most beautiful, intelligent and bright young girl with her whole life ahead of her. We need time alone with family and friends to start to come to terms with our loss."

Police have appealed for information from the public as they seek to establish the teenager's movements after she left her home in Rossington, planning to catch a bus into Doncaster town centre to meet a friend.

The Times quoted John Willis, one of the first passers-by to find the dying girl and stop to help, as saying: "We got her in the recovery position. She didn't move a lot and she didn't speak. Her breathing was very shallow and she was very pale.

"The police arrived very promptly and took over the situation. I was very upset -- it was very shocking."