Princess Polly and the Pony

I want to get muddy and ride  ponies and race.

  Today I read "princess Polly and the Pony", an USBORNE FIRST READING, level four book.
 There was a Princess Polly who likes galloping on ponies. One day, she was in a trouble because she have got mud on her cloth. Her parents didn't like her to do that. That why, they got angry. "Princesses must not gallop," the King said. Then "Being a princess is boring," she said.

 After that, the King took her to the Royal Tower for she doesn't to gallop any more. On the way, she found a poster, which said "Pony Games". All ages could join that. She thought "I'd like to be in a race". If she get a first prize, she can get a Royal Wish. "Your mother and I are giving the first prize. Of course, you can not enter." said the King. At that time, she came up with a nice idea.
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What's a nice idea?
Could she join the games?
Did her parents allow her to gallop? 

Please try to read!!!