A minor point. I would use the past perfect here: At first she had n't recognised him... Otherwise it's fine.
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BarbaraPAIs it normal for 13-year-old children to call each other "Mr" and "Miss" where you are?Perhaps the short story is set in Victorian times - upper class, of course.
BarbaraPAI started there, but then, a 13-year-old girl wouldn't be walking by herself, would she?The story does not say she is by herself.
BarbaraPAThe writing is fine - it's just not very plausible.I agree.