She is derived from the Green Lantern concept in terms of powers, intro, marketing etc. Not every GL character has to be part of the Corps. Alan isn't. Doesn't matter how you dance around it. Steel isn't Kryptonian and yet he's a Superman character, so. . .?
She is under 18, has GL-like powers, and a green costume, and I don’t like the concept, regardless if it’s her Kai Ro or Tai Pham. Execution doesn’t matter. Just my personal opinion on the concept.