Good day. This really works for me. Fruit and Vegetable Diet for 1-3 days. Fruit juicer is a must have; FRUIT JUICE RECIPE: 2pcs carrots, 2pcs Apples, 2pcs Seedless Orange. For breakfast you can eat any fruit you like as many as you like and drink the fruit juice.For lunch and dinner you can have "plain" baked potatoes and boiled or steamed broccoli or corn or sweet potatoes and the likes, whatever suits your taste and the fruit juice.
Don't allow yourself to feel hungry otherwise you will find it very difficult or even impossible to do this so eat fruits and/or vegetables frequently and drink the fruit juice as often as you can. If you have work drink it before going to work, bring cut, ready to eat fruits,veggies with you. When you arrive home from work, drink the fruit juice again and so on.
This would be very beneficial to your health as well, you're giving your whole organ system a well deserved rest.
As for exercise, to lose fat you have to do cardio exercises. Depending on your age, you actually have to raise your heart beat to a certain rate before you lose fat. As for my age it's approx. 130 beats per minute. You can check it out in the net for a more accurate data. So if you have access to a treadmill, do at least 30 minutes to an hour or so a day. If treadmill is not an option you can Jog in Corniche, it's a great way to spend your free time.

Tips:
Don't peel the carrots.
You don't have to remove the seeds of apples.
Set your goal for 1 day first.
You can search for different fruit juice recipes, the one i gave you is my favorite.
No salt, oil, and the likes.
Other Fruits and Veggies Suggestion:
Tomato
Asparagus
Cucumber
Eggplant
Olives

Pears
Papaya
Watermelon
Banana
Lemon

Anyways, good luck. Hope your wife finds the regimen that will work for her.