Question

What to reasons the narrator give to explain that she was mistaken
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Answer 1

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She thought that perhaps the woman was not Mrs Dorling. She had seen her only once, for a brief interval and that too years ago.

Answer 2

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She thought that perhaps the woman was not Mrs Dorling. She had seen her only once, for a brief interval and that too years ago. Secondly, it was probable that she had rung the wrong bell