My son stepped on the front of my daughters ankle. She tried to pull away and now her ankel is yellowish brui?

bruised and hurts to run or jump. She is a power tumbler and tried to tumble on it. She could do her back-handsprings, but hurt to jump up to do her stick-it rebound at the end. She is icing it. She has Nationals in four weeks. Any advice? She is nine years old.