@michael_allen
You can't move it or delete it, at least not yet.There is a feature idea open to allow for this: https://community.canvaslms.com/ideas/4394-delete-submissions-by-students
For now, you can optionally have the student go back and turn in assignment 5, although I would recommend it if possible. When assignment 6 comes along, she just submits over what is already there. Canvas allows multiple submissions on assignments for now and you'll see the latest one when you go to grade assignment 6.
There is development going on within Canvas and one of those areas is with assignments. One item in development is to limit the number of attempts, but for right now, students can submit multiple times (you can restrict attempts on quizzes) and so the student submitting assignment 6 by mistake won't keep her from resubmitting it later. See https://community.canvaslms.com/ideas/1799-restrict-assignment-submission-attempts
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