Pretty sure bunnyhopping - while easy - is probably inefficient for max speed. Too much energy being wasted not pushing for speed, and too infrequently.
Think formula 1.
She want to get speed records, she may want to keep contact with the ground, pushing her forward as frequently as possible to maximize acceleration, traction and minimizing energy bled off due to air resistance.
If endurance and strength aren't limiting factors, anyway.
Horizontal speedclimbing, basically. Push off just enough to stay roughly as far from the ground as needed to maintain easy contact with it, grabbing on/pulling down to counteract force trying to get her airborne, and excerting every bit of possible force to go forwards faster.
Not good for the integrity of whatever surface she's moving on, tho. And probably can't be called running, either. (Maybe some form of parkour?)
And, I suppose it depends on how much inertia she can use against air resistance, because there is a mechanical limit to how fast she can reposition her limbs to keep pushing her in the direction of travel.
... Probably applicable for speedtrials on water too, though.