My wife wrote two papers covering different aspects of the same experiment, and copy and pasted the experiment setup description (a couple of paragraphs) from o

My wife wrote two papers covering different aspects of the same experiment, and copy and pasted the experiment setup description (a couple of paragraphs) from one paper to the other. The plagiarism detection software of the journal she tried to publish the second paper in flagged the paragraphs and they refused to publish until she 'fixed' it.