my lazy student

I have a class in primary 3 today. This is a General Studies lesson, not English.
One of my students did not do the workbook. She showed that she did not know how to do it (but all the rest did the job). I tried to teach her. But I found that she could not spell and understand all the words (even the DATE).
Poor girl, what can I do for her?
I wanted to help her, but she refused. She showed that she is lazy and does not want to learn.
How can we help the LAZY students in learning (all the subject, including English)?