[spidey]

You need to measure the food with the same measure every day and/or weigh it, so that you know exactly how much you're feeding, too many people just eyeball the amount of food they feed and you can be overfeeding by a large amount if you do this (also, do not go by the amounts on the food bag, these are almost always WAY too much). Generally, if you cut the food back by 25-30% and increase the exercise (regular walking on a leash, which is good for you, too), you will see weight loss fairly quickly. You should also weigh the dog on the same scale at least every week or two to make sure she's actually losing weight, if not, you need to cut back the food even more.