“我不会“

jw likes to use this phrase to me : "i don't know."
Teacher gave her worksheet, she can complete it in a glance of time all by herself. A similar worksheet given to her, n this time with my supervision. It becomes worse.
She was depend on me to give her the answers.
"you know it. You can do it. try, try harder!"
Maybe i should leave her alone when she's supposed to 'rack' her brain.