Leanne walks with Katie from the Three Broomsticks in Hogsmeade up the road to Hogwarts. The pair argue as they walk, and tussle over a parcel Katie is holding, which drops to the ground. Leanne screams when Katie rises up into the air and begins to shriek, and tries to tug her friend back to the ground.
Leanne tells Harry, Ron and Hermione that she and Katie were arguing about the parcel Katie was holding. She was suspicious when Katie came back from the bathroom in the Three Broomsticks with the parcel, and thought her friend was stupid for agreeing to deliver it to Hogwarts. She tried to persuade Katie to leave the parcel, and grabbed at it when Katie wouldn't listen. Leanne is horrified when she realises that Katie was Imperiused. She walks back to the castle with the trio. The group are taken to Professor McGonagall's office by the teacher, and Leanne retells her story, attempting to control her crying as she does so. When she reaches the part about the parcel tearing open, she is so overcome she cannot speak. Leanne is sent to the hospital wing by Professor McGonagall to get something for the shock.