There was all this speculation about the character Kleya being Leia, largely due to her mysterious vibe and the red cape that echoed Leia’s style in 'Obi-Wan Kenobi'. However, the creators decided against bringing Leia into 'Andor'. It seems they wanted to keep the focus on Cassian and the gritty, grounded rebellion narrative without slipping into the temptation of legacy characters. I think that’s pretty smart since it allows the show to stand out by highlighting lesser-known characters and their stories.
Tony Gilroy, the showrunner, did mention in an interview that they considered a subtle inclusion of Leia in Season 2, but ultimately felt it would distract from the main storyline. The thing is, 'Andor' thrives in its own unique storytelling space, and throwing Leia into the mix might have shifted the focus away from Cassian’s journey and the broader themes of resistance and survival. So, while Leia’s spirit of rebellion is always there, her actual appearance isn’t part of 'Andor', at least for now. I think they made a bold choice sticking to their narrative guns, and it seems to have paid off!