If you'll excuse a male perspective here, I had to do a lot of gaining and losing when I was power lifting a few years ago. Due to the nature of the sport, when you need to make a weight class, doing it in as healthy a way as possible is key. Doesn't do you any good to be in a weight class if you're about to feint from malnutrition. I've always had a hard time losing weight so I really struggled sometimes. However, I did find a way to lose 35lbs. over 1 summer. The key for me was diet and resistance training, especially swimming. You may have been swimming before and noticed that you were just famished when you got out of the pool. This is because simply moving around in water causes quite a bit of resistance and calories burn off really quickly. Basically I went for a nice long swim, and then gorged myself on lots of protein when I got out. In my other meals, I just made an effort to limit carbs/sugar. Worked wonders for me when nothing else did, and I felt great. Actually doing the same program again this year, working well so far.