Wondering: How do you motivate to students who are being lazy with their work?

   Throughout my pre-internship so far I have noticed that there is one student that is very fidgety and lacks motivation. K is what we will call her. K becomes very lazy with her work. For example, if she does not want to do the writing assignment she will make three word sentences and write in her worst handwriting. Even if it is a coloring assignment she will color like a pre-schooler rather then coloring like a second grader with a goal of working hard. In addition, her performance while the teacher is teaching is noticeable. She is constantly rocking her chair back and forth, playing in her desk, looking at another book, or just basically doing anything to avoid the actual assignment at hand.
   On Tuesday, I came in and my mentor teacher had shown us K's work. She had colored an assignment completely like a two-year old. According to Tomlinson and Imbeau, "teachers need to let students know that they will often hear you ask, Is this the best you can do---the most you can give to this task?" My mentor teacher did pull her aside in the beginning of class and asked her, "Is this your best work?" Throughout that day, we walked by her desk to remind her to keep up with working to her full potential. That day she was writing in her neatest hand writing and working to her best.
   The next day, however, she was back to her fidgety self. I want to challenge this student to work to her full potential everyday. The outcome will be remarkable. However, I am stuck on how to do this, which leads me to my revised wondering.

Revised Wondering: How do you motivate students to work to their full-potential all the time?