Chukuma finished third in the first heat with a time of 12.03 seconds, but cut almost a second off her second attempt, crossing the finish line at 11.17 seconds before claiming the gold on Monday, reports Xinhua news agency.
"I am happy and satisfied because before coming to Argentina I did not have good results," Chukuma said.
"I was scared that I would not get what I hoped for at these Games. I started to train in 2016 and I travelled to Australia last year to prepare in this discipline, then continued training in Nigeria."
The Youth Games are set to close on Thursday.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
