A 15-year-old girl accused of sexually abusing a drunken schoolgirl and photographing her while she was unconscious told a jury it was a joke at the time and she did not mean to hurt her.

The teenager said it was a boy aged 15 and a 14-year-old girl on trial with her at Bradford Crown Court who kicked mud and grass on the comatose girl and ripped off her clothes.

She told the court all three of them took pictures of the 13-year-old girl on their phones and she sent several of them to another boy.

The teenagers, who cannot be named, are accused of humiliating the girl to entertain themselves at the start of the school Christmas holidays.

All three deny sexually assaulting her in a field in Queensbury, Bradford, on December 22, 2011.

The 15-year-old girl pleads not guilty to taking or making indecent photos of the girl and distributing some of them. The boy and the younger girl deny taking indecent photos of her.

The 15-year-old girl told the jury yesterday she was 13 at the time of the incident. She and the other two defendants were with the girl, who was drinking neat vodka and spinning round to get drunk quickly.

She had stolen money from her mother to buy the vodka and had downed most of the bottle.

“We were just joking about and having a laugh together,” the 15-year-old girl said. After she fell over, the girl was “making weird noises, like mumbling.”

“I didn’t realise how drunk she was because I had never seen anyone in a state like that. I thought it was a silly joke,” she said.

The others ripped off her clothing and the 14-year-old girl moved her into different positions, she alleged.

“I was laughing and someone started taking pictures. I did not think we were doing anything wrong at the time,” she told the court.

She said she thought they would all laugh about it afterwards, including the drunken girl.

Asked by Nick Askins, for the Crown: “Did you think the pictures were rude?”

The girl replied: “Not at the time, but obviously, now.”

The trial continues