The tail won't grow back, just so you know. There might be some growth, but it will be associated with regular growth in the area and not regeneration, since iguanas don't do that. How long has it been since she lost her tail and/or you noticed her growth slowing? Do you weigh her in frequently, or are you just judging by the way she looks? Pictures are always helpful, if you have them.

A herp vet is usually going to be your best bet if you feel this is a serious problem, and if you have to drive a ways to find one that might just be a sacrifice you have to make. You can try jump starting her appetite with some fruits like mango and papaya, and sometimes bananas or grapes (mango and papaya are a great part of their daily diet, but bananas and grapes are more a once a week thing). Hand feeding her some fruits she likes can also be a nice method of taming her down if she's that spooky.