...well, i had that problem too, when i started hitting the 9-ish foot marks. My "run" down the runway, was inconsistant, i would either start out too fast, and slow down right before take off, or it would be the other way around. It is bad to be inconsistant because that makes it harder to diagnose the problem. Do you know if she is taking off "under"? The term under means, if you're not familiar with it, that when you take off, instead of jumpin off the mark where you are supposed to take off on, you may be way infront of it....
..So to correct this my coach and i did a lot of practice "runs" off the p.v. runway, We worked with something called a sliding box. Basically you plant your pole in it and it is built similar to the real planting box on the runway. YOu don't have to hold back energy cause the box slides once you impact it...Also, she should keep in mind, when concerning the run, to maintain a good posture and to pump her knees high when she comes down the runway. Sometimes a bad plant can mess with your run too, its hard to think about the upperbody and the lowerbody at first, but if you do enough warm ups everysingle day then you can start backing up to further runs....
My advice overall is to start out with fewer steps, and work up to more gradually while keeping in mind the correct form. Be patient with it, it'll come soon i promise
Goodluck
Liz