I assume you will be working out at a well stocked gym, so I might suggest machines and cables at first. Just to get her SLOWLY adjusted to resistance exercise. Try 3 to 4 weeks of general getting use to going to the gym and training. Circuit training (including free weights now) might be the best bet for her after those first 3 or 4 weeks. Something to raise the metabolism up a few clicks.
Cardio might include some light treadmill walking at first. Or any other training forms of cardio work the gym has. Again, everything SLOWLY to begin with. Try for 3 days a week, with the light cardio included with the weight work. Maybe saturday or sunday some extra cardio work like bike riding, walking/hiking, etc. Never too much cardio at first. 15 to 20 minutes as a breaking in goal. Increase , if you want, after those first few weeks. Also might consider something alone the lines of the Tabata protocol and other forms of interval training.
Might also want to cut the carbs a bit. Below 100 a day, at least. Or adopt a different diet plan like the Zone diet, etc. Also get a body fat reading, which can be more important than what she might weight now. Did not give her age, which also will have be be considered on how fast the fat lost will be. Good Luck.
