Sorry, I didn't read the thread closely earlier - just saw you were looking for vets in Florida and posted some northern options. I've rescued iguanas in the past with broken tails and they always regenerated black. She undoubtedly stopped eating due to the trauma but it sounds like she's coming around now. I can't tell so much from the pictures but if the black on her tail is new growth I wouldn't worry about it. If the black is actually expanding towards her vent then I would worry and get to that vet asap.