A tumor cut off blood flow to a small section of Gia's brain, and as a result she struggled to understand the words that were being spoken to her. The damage to Gia's brain was probable localized in her:

The correct answer is-Wernicke's area.

Explanation:

Wernicke's area is located on the left side of the brain in the temporal lobe. It is that region of the brain which is responsible for language development and language comprehension.

So if a problem occurs in the Wernicke's area of the brain than it will be difficult for that person to form a meaningful speech and understanding the words being spoken to them. That person will be able to talk fluently and in phrases but his sentences might lack meaning.

Therefore the damage to Gia's brain was probably localized in her Wernicke's area.