You can buy Wii Fit, it will measure your BMI and has some exercises to help you lose weight or tone up. (or yoga). You can also do exercises in Wii sports with your daughter, that would be fun!
If you only have half an hour you could try speed-walking or light jogging around your neighborhood.
Breakfast.. Eggs/egg-whites with low-fat cheese and veggies, cereal with nonfat/1% milk is fine like Cheerios, you can have a peice of fruit too.
Lunch.. Salads (i like Caesar salad lite prepackaged), hummus/cheese/veggie sandwich on low-carb/whole wheat bread, I loovee Morningstar's frozen veggie corndogs. They're 150 calories and so good! Morningstar also has great fake chicken, fake burgers, protein spinach bites, etc.
Dinners.. Lean Cuisine or Amy's have good, low-calorie vegetarian dishes that are quick to prepare (frozen food). Or veggie and tofu stir fry.
Snacks.. Sugar snap peas with veggie dip, yogurt, low-fat mozarella sticks, apples, pears, etc.
Remember to keep it relatively low carb and under like 1500 calories. Good luck!
I'm a vegetarian, been on a diet (~1200 cal) for almost 2 weeks and lost 4 lbs so far =)