Lyra Mathew Black shouldn't exist in the Potterverse. But, when neither she nor anyone else knows about it, you can't fault her for the changes happen to canon because of her existence, can you? If you were to tell Lyra this then she would have called you a lunatic and spewed some cusswords, before hexing you to oblivion. After all she did have the infamous Black Temper. OC-Insert.