She was hand-picked by Shao Kahn to serve as Sindel's personal protector. However, she becomes suspicious of Shao Kahn's loyalty towards her race of Shokan when he places Motaro as the leader of his extermination squads. On the Outworld, Motaro's race of Centaurians are the natural enemy of the Shokan.
While Sheeva serves her master on Earth, her race of Shokan are being
punished on the Outworld. Kahn now favors Motaro's race of Centaurs
and aids them in defeating the shokan. After learning of these events
Sheeva turns on her master. She defeats Motaro and in a rage brings
down Kahn. In freeing the Earth she also frees the Outworld. She then
returns home and works to restore the pride and respect of her race.