Uma, who had won her first international title against Emma in 2012, was undone by the English pro in a tough final game that lasted around two hours.
Uma missed a cannon at crucial juncture, which brought Emma to the table and she rode her vast experience to pocket her eighth WLBSA Billiards title.
A Group of five players played each other to decide the finalists at the Leeds Billiards and Snooker arena.
The World Billiards title was first won by Indian cueist Anuja Thakur in 2005 while Chitra won it in 2006 and 2007.