How to lose the last 15 pounds?

I used to be overweight and have lost a lot of lbs to be where I am now. Currently, I am between 5'6"-5'7" and 145lbs. I would really like to be 130 lbs by the end of the summer… However, the past 4 weeks I have been eating really clean (all organic, nothing processed) and the scale will not budge. I realize that It could be muscle so I am taking measurements too but it is really frustrating that not much is changing. I am exercising as well but due to recent surgery, I can only do the elliptical and some toning exercises. Any fitness/health/weight loss gurus have any advice?
How to lose the last 15 pounds?
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