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Factor 1: The Purpose and Character of the Use
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Did the author attribute your daughter's work as "from the internet", or directly present as the author's own word?
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Factor 2: The Nature of the Copyrighted Work
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What is your daughter's article? see factor 4 as well.
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Factor 3: The Amount or Substantiality of the Portion Used
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How many words/paragraphs are used?
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Factor 4: The Effect of the Use on the Potential Market for or Value of the Work
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Was your daughter's article freely avalable? what's her damage on being copied?
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The issue might lie in "attribution" instead of copyright infringment. The author's proposal "以后会加她的名字或改掉。" is reasonable.
Since this publisher is a big house, most copyright firms might have business with the publisher so that's why their lawyers cannot help your daughter. If fact I think most major copyright law firms might have business with this publisher. You need to dig deep to find small or medium sized copyright firms in NY.