There are 3 themes for this story:  The first theme is that  no matter how bad at something you are,  if you want to pursue it and you try hard enough, you can acheive your goals. The second theme is to be careful for what you wish for, Whisper thought that she had no chance of winner the contest, but she ended up winning. The third theme of this book is to let the past be the past. Whisper wouldn't play soccer beacause she kept looking back to the past when she made a mistake. 

Photo used under Creative Commons from wjarrettc