I agree the 1/2 cup of dry food a day is not what is making her overweight, it is the treats and last bite of human food.

She may seem really hungry and beg a lot, but don't give in, I would actually give her more dry food at each meal -maybe giving her 2/3 of a cup of food in total per day but ONLY if you can make SURE that hubby is not slipping her treats

if you cut out all treats and only feed a 1/2 a cup of food a day she will be really hungry... a bit of canned greenbeans or carrots or other veggies are still giving her treats but they are much better for her and she will lose weight.
I would also try adding a little more exercise. I know you are working really long hours, but even just adding a 15 minute ball game

twice during the day or take her for a short leash walk for your lunch break- that added little bit of exercise will do her a lot of good and will probably be a nice break for you too!
You mentioned food change ( the kibble) and no one really addressed that, I hate to because it opens up a huge can of worms , but take a look at the nutrition threads here, Darci has posted some wonderful links to some great foods. I am currently feeding Timberwolf organics to my two and they are loving it..Dillon is really thriving on it. best of luck to you , i know you can do it! :yeah: