Since nothing could be done at the last moment, then ask your  friend to take enough practise at home and be physically and mentally prepared for the competition. Try  to make her realize her fault and attend the rest of the rehearsels more seriously than the other competetiors.
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can u pls give me some othr points also
wait let me thnk
now is it ok
This i very serious situation.this friend should pratice for dance as we know pratice makes man perfect. this friend should conselt her mother or her teacher .he or she should have confudent and have more and more pratice that every one reliase that without rehersals one can do dance if have passion to win in life.
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sorry to say this shivangi u have typed some spelling mistakes
but still u have given a very good answer which may be useful even for me some day
ok from next time i will remember and try to not to make mistake
i am so sorry