Doctors said the surgery would be performed in a few weeks, after the patient’s burns heal completely.
The girl is currently receiving medical treatment at a hospital in the capital, Kabul.
At least 15 students of Nazo Ana girls' high school in the southern city of Kandahar were attacked by unknown men, who sprayed them with acid.
No one has claimed responsibility for the attack.
Most of the students sustained severe burns on their faces, necks, and hands.
The Afghan government called in a plastic surgeon from Turkey, Akbash Hayati, in response to demands from angry parents. The surgeon will be examining the other victims in Kandahar in the coming days.
One Kandahar woman, whose two teenage daughters were among the victims, said her children’s lives would never be the same again as the attackers had “scarred them for life,” both physically and mentally.
The Afghan government said the attackers removed the schoolgirls' head scarves before spraying them with acid.
Afghan officials blame Taliban militants, who have killed dozens of teachers and students and torched many school buildings over the past several years.
Under its strict interpretation of Islam, the Taliban regime banned girls from receiving educations while it ruled the country before its overthrow in late 2001.
(by RFE/RL correspondent Farangis Najibullah)