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She's Angelina's friend
she was there when Angelina got attacked by the necklace in Hogsmead.
It's Katie's friend.
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I honestly can't remember when 'Leanne' is mentioned in HBP though.
Leanne is the character arguing with Katie Bell to return Draco/Rosmerta's cursed necklace back to Three Broomsticks.
It's a small part.