I would have her start training with you. If you do circuit training right off the bat you are likely to burn her out. A circuit is preformed with little rest and doing one exercise right after the other.
I train doing some plyometric work and free weights with machines doing the same exercises as most guys. Plus she is likely to feel more comfortable starting with you. As she builds a little muscle then she can decide what training style she wants. Make sure she gets in 3 days of cardio as well. And nail diet down.