Malaysian Muslims below the age of 16 are allowed to wed with the permission of religious courts but the union between the girl and the 41-year-old trader went viral on social media and reignited calls to end child marriage.
The ceremony took place in June over the border in Thailand's Muslim-majority south in Narathiwat province, where the girl returned to Wednesday after "immense pressure from Malaysian media", the provincial governor Suraporn Prommool told AFP.
The 11-year-old is believed to be the trader's third wife.
Suraporn said she is undergoing mental health counselling because of the intense level of attention.
"We cannot do anything (to annul the marriage) because they married under the religious law," he said.
The trader, however, could face six months in jail if it is found that he did not get permission in Malaysia.
Malaysian activists in the multiethnic and predominantly Muslim country say some 16,000 girls below the age of 15 are already married.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)