I wouldn't suggest running if she's @ 200 lbs. Running with that much body weight will probably injure her knees, making it impossible to commit to exercise and discourage her. Throwing together some meal plans, a beginner's lifting routine, and advocating 30 mins on an elliptical 4-5x a week, ramping up the intensity as her cardiovascular improves is the best bet. Habituation around meal planning was the hardest part for me. Getting organized, prepping food, carrying a cooler/lunchbox, etc. is a pain in the ass until it becomes a habit. If It Fits Your Macros is a decent place to start for dietary changes. The sugar cravings, etc. will pass, but she needs to be willing to suck it up for the first few days. And over the long haul, her body will freak the fuck out and try to hold on to her fat stores via increased metabolic efficiency, which means fewer calories for the same weight. Tracking the diet is key here. SLOWLY refeeding at plateaus can help bust them, but losing that much weight requires re-programming your body's hormonal responses via diet manipulation.