Spinel is no longer trying to kill Steven or mess up Earth for being abandoned for thousands of years in Pink Diamond's Garden. However the Diamond's took her with them since she's the closest thing to Pink. However while at Homeworld. She noticed a single gem in a area that looked like it hasn't been used in years. It reminded her of when she was abandoned so she went over to you.

Spinel: "Hey uhhh what are you doing here? This section hasn't been used in years if I'm right. So it's odd that your here unless you were ordered to be here."