First off, free ride? Fucking sweet.
Secondly, that board should be fine unless she's a hardcore freerider. If she wants to fuck around in the park more, that'll be a perfect board. Even if she's more 50/50, it should still satisfy her until she can get a secondary board more meant for freeriding.
About the bindings, the only problem is making sure she understands how to set them up. Flows are supposed to be almost (if not just as good or better) than conventional bindings once you get them dialed in.
Finally, I'm sure she'll have a blast once she's out on the mountain. Don't worry about it too much and just enjoy the fact you have a girl who appreciates the same thing you do.