How is their weight? If they are eating a lot and fat, you may need to put on lower calorie food (the green beans/pumpkin is good). If thin, may need to check their thyroid. At their ages, it can cause problems. Please get a full panel run.
If both front and back, could be her spin. I'd have the doctor check her. I have had good results using bromelain (it is from pineapples and a natural anti-inflammatory). You can get it off amazon or some health food stores.
