Spinel is the main antagonist of Steven Universe: The Movie.
She was created 6,000 years prior to the events of the movie to comfort the lonely Pink Diamond, who had lost her first Pearl to White Diamond. The two would play in Pink's garden until she was finally given a colony. At this point, Pink outgrew Spinel and abandoned her under the guise of playing a game by having Spinel stand alone for thousands of years while Pink never returned. After discovering this through Steven's message to the universe, she went to Earth and attempted to destroy all organic life forms on the planet as an act of revenge.

you can't, she is still waiting in the garden