Hey Chris, it might help if you mention what camera body and lenses you'll be using for your photoshoot. That way we'd know what to suggest for settings
Here is where I would start.
If you're going to be shooting indoor and have lots of light to use, then set your body for a minimum of ISO400 and start from there. If you're stopping the action at that ISO, then only worry about the Aperature and Shutter Speed. If you still cant get enough light out of the camera, then work up to a ISO800 which should be more than enough.
Ideally you'd like to keep the ISO as low as possible to keep the noise down, but for the most part, if she's only using them in brochures and on her website, then the photos will be posted small and grain wont be too much of a problem.
One thing to remember is to Pan with your subject and be far enough away from them to be zoomed in so you've blurred out the back ground. This will make your subject jump out of the image and make a more powerful image all together.
If you have a lens that can stop down to f/2.8, you should be good to go. If using an off-camera flash, make sure it's not pointed right at your subject because it will cause a goofy halo or throw a shadow around them which will make the image look very cheesy.
If you dont have an off-camera flash, wrap a napkin around your pop-up flash to help absorb some of the harshness of it.
This goes same for outside as well as indoor. It might be cool to actually position the sun, or your main light behind the subject and have them jump, or dance in front of the bright light with the flash just providing a small burst to get rid of the shadow.
One thing to make sure of is to limit your background clutter. When indoor, position the dancer in a corner that has two mirrors on each side, but make sure you're out of the image. This will show multiple angles of the dancer in one image and should help with the lighting. Just make sure the reflection in the mirrors doesnt have a ton of clutter in the background
When outdoor, only have the horizon or sky behind the dancer. This is where you can get really creative and lay down on the ground which will make the dancer look like they're way up in the air and they'll only have the sky as the backdrop. Again, your flash powered down will help stop the action, yet take care of any shadows that might be hiding certain areas while the dancer is in the air.
If the studio has a big white wall, which most do, this would be very easy to have the dancers jump or dance infront of the wall and you could very easily blow out the wall in photoshop so it would look like the dancer is almost cut and pasted with nothing behind them but solid white. Google Dancer images
and you'll get an idea for a bunch of different looks to put ideas in your head.
Good luck with the shoot, and make sure you post some images so we see the results. Also, draw up a simple model release and have all the dancers sign it before hand. This way, when you have the pictures, if you ever want to use them as Stock Photography or have a chance to sell them at a later date, you have a signed model release in advance. Feel free to shoot me an email and I can send you a model release I use in Word Format and you can change it any way you like to suit your needs. But it's something that has come back to bite me a few times when I want to sell an image or a magazine wants to use it and I dont have a model release and have no way of getting ahold of the model in the shot.