I ride the Eminence and LOVE it! It's similar to the Ollie Pop which I also really love. They are both C2 BTX from Mervin...rocker/camber hybrid, both have magnetraction (which it doesn't sound like she will need) The Eminence is lighter, faster and stiffer than the OP, but both are super fun boards.
The Arbor Cadence is cool too...it's rocker with grip tech (again probably not a real benefit in her case)...it's pretty flexy and while a park board by design, it's really a great all mountain board.
The Cadence comes in at $399, OP $449, Eminence $539. The Eminence is my favorite of the three-but I'm totally biased. Any of the three will serve her well for what you describe...as I am sure a bunch of other boards would too...these are just three I have experience with.