poem, author, then cheater...

I used to love writing years ago, now i am having trouble even i write with my native language. I know if i push myself harder and do more practice i would write better. When i was at sixth grade, i tried to write poem for competition between middle schools. I had done good job. My only mistake was i took help from my mom. After i finish the poet, i was so proud. The teacher told me i can not partcipate the competition. The reason was i cheated she said. I was upset and i explain that it is not possible. I acceped my mom helped me but it is not cheating. I still dont know why did she comment like that to my poem. Only thing that she believed she had read the same poem before because my mother may read the same poem before. She she never read any poem as we wrote. who knows maybe the teacher could not believe i could write that good