Question

She saw her brother Peterkin
Roll something large and round,
which he beside the rivulet
In playing there had found:
He came to ask what he had found,
That was so large, and smooth, and round) who refers to she here
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Answer 1

Answer:

according to me its a poet......

Explanation:

hope it help u

Answer 2

I think she is been referred to the poet who has written this.