You don't.
It's a long journey. All you can do is set goals along the path, get to l7, get x skill. There will be setbacks along the way, injury, growth, puberty, fears. Overcoming these is as hard as gaining new skills. Sometimes the ones who make it aren't the ones who stand out in the early levels, but the ones mid pack who work hard, persevere, and just keep at it. Mostly it's a war of attrition.
Focus on the journey. If it gets her to elite, yay! If not, she will have learned so much along the way that will set her up on other paths she might take. At this age she needs balance too- don't make her life about reaching elite.