Here is an article on stride length.
http://www.dragondoor.com/articles/the-holy-grail-in-speed-training/default.aspx
She needs to find her number of steps and start point and make it consistent.
Our girls at the gym I was at in 2011 did these things. I coached the L4s on Vault and most of the time, the L5s unless I was on Bars or Floor. However, this programming was done by our Ukranian former Olympian coach who came over from another gym. One of his girls went to UCLA so he was doing something right.
Leg/foot for the hurdle onto the vaulting board and into Round-off was the same foot. This is because of Yurchenko vaulting later on. Ideally, a gymnast hurdles the same for RO and FHS but I do see that being opposite on occasion.
6 steps on one foot, 7 on the other. I want to say it was 6 on the take off leg. Don't quote me on that till I find my notes somewhere.
For instance, my hurdle is on my right leg lunging but I am actually taking off my left leg as I am swinging my right leg. It was the same for Polevault in HS.
Number of steps is incredibly important for Polevault and I think Long Jump. I never did Triple Jump but one of our L4 coaches who was a triple jumper said they took steps for it. While I was coaching our 4s on V most of the time, she coached them some of the time if we split into 2 groups or I could not because she understood the vaulting program and was a triple jumper and said Ukranian said she was our next pick after me.
I can't exactly remember but I don't think the number of steps for the 100, 200, 400 were discussed much back in my days. Possibly in the 100. No idea about hurdles as I am short so I laughed when they said try hurdles on the varsity height hurdles.
Having a correct step was something Mark Young out of West Valley and Amy Chow stresses during his vault clinics at Congress. He has all sorts of drills for it.
Once I could find the correct number of steps with some of the girls and the starting point I only had to flush away stuttering approaching to the board, decelerating and the right hurdle length for each girl (but this is sort of dependent on how fast they are and how powerful they can jump).