Supergirl | I think I downloaded the wrong movie

The film Supergirl tells the story of Kara Zor-El, Superman's cousin who lives in the isolated city of Argo City. When a life-support power source called the Omegahedron is lost and falls to Earth, Kara follows it to Earth and disguises herself as a schoolgirl named Linda Lee. There, she transforms into Supergirl to reclaim the object from the clutches of an evil witch named Selena. However, I did not see any scene where they fight over the Omegahedron in this movie 🤔