I should just say to her to improve  her studying skill.......................then
Next time she will surely get good marks......

u too
ya i can
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The Brainliest Answer!
I would try to make her understand and realize her mistake. this is really a very bad thing to blame the teacher for the mistake she has done. i will make her understand the importance of studying and tell her to improve her studying skill. i would give her some tips for better studies and help her in studying. in this way she can surely improve her condition. 
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thnxx for marking my answer as brainliest