Lina was last seen on Monday between 4 p.m. and 5 p.m. at a playground in San Antonio, according to police. She was with her mother who left her alone for an unknown amount of time, police said. When Lina's mother returned, the young girl was gone, according to police.
A department spokesperson told ABC News there is no indication that Lina is with a family member.
Lina is white, about 4 feet tall and weighs 55 pounds. She has straight, shoulder-length brown hair and brown eyes.
Police said she was last seen wearing a black jacket, red dress and black shoes.
This case is still active and being investigated, according to police.
Authorities are asking anyone who has information on the case to call SAPD Missing Person's Unit at 210-207-7660.