She is suspected on probable cause of being an accessory to murder.
The detention hearing will take place at Stockholm District Court, which is serving as the emergency court this weekend, on Sunday afternoon, the court confirmed to TT.
The 24-year-old woman was shot dead on Friday, October 16. At the time of the shooting at the sports facility, a floorball match and a football match were being played nearby, with many people present.
Two teenage boys have previously been detained on suspicion of murdering the woman. Another boy is being detained on suspicion of, among other things, aiding and abetting the murder.
