A teenager remains in hospital after being attacked by a group of girls in a playing field. The teenage girl was assaulted in Mortimer playing fields, opposite the Horse and Groom pub, on Saturday (February 24) at around 5.45pm. Thames Valley Police is appealing for witnesses to the grievous bodily harm incident. TVP said the group of girls kicked and punched the victim and dragged her by her hair. A car then arrived and a young female passenger wearing a white dressing gown got out of the car and attacked the victim before returning to the vehicle and leaving the scene. The victim has sustain…