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You answered it first.
But yours lacked depth, details, and formatting, compared to hers.
People usually vote up beautifully formatted and detailed answers more.
Can't say she copied yours - maybe she did, but there's not enough evidence.
Don't go and edit hers.
I have a few quibbles with this answer.
Is this effort even necessary? Has there been some increase in
plagiarism lately on ELU? Or some particularly egregious cases?
Anything that requires explication of the general policy?
This one is merely an issue of style. File it in the category of
How to get over ourselves. Can we drop the references in the ...
The purpose of editing is to clarify or otherwise improve a post. Feel free to add citations and attribution when it is clear what the probable sources are (e.g. a direct quote containing many words). The appropriate mechanisms for noting unproven but suspected plagiarism are comments to the suspected plagiariser and, if necessary, flags to moderators. You ...