Answer:
Occipital.
Step-by-step explanation:
Occipital lobes are present in the cerebral cortex of the mammals and one of the largest among the four brain lobes. This lobes acts as the visual center of the human's brain.
The child has lost her vision in the accident but still her eyes are fully functional. This might happen due to damage in the occipital lobe of the brain. This effects her vision as the occipital lobe is mainly involved in the vision center of the individual.
Thus, the answer is occipital lobe.