Answer
Because Zealot isn’t a superhero, she’s a soldier.
I don’t actually want to make a huge deal of it though, because it’s an incredibly minor detail— I think that cameo page was just more or less everyone from an ongoing (or ostensibly on a team in an ongoing), as a demonstration of “everyone is on the League now”. I highly doubt she’s going to show up again in this book, outside of a similar groupshot cameo.
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Also I don’t know why they’re like really digging into the samurai armor, Z had like, several really solid looks and none of them were in any way Japanese. This is a white woman. I know you can’t really go Greek because of Wonder Woman but it’s not like they were Greek either you can just put her in her old costumes. It’s fine.
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I know the whole point is that it’s literally everyone but also Z on the justice league I fear we’re so over
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OC-Tober: Day 29. In Ten Years
The Age of Chaos will bring about a great deal of change in many people. For Zannah, it has already taken the life of her son. It’s taken the home and thousands more lives of her people. The Hasai are few now. For the former Empress, there is only one course of action. Trained as a child soldier, fighting and war is what Zannah is best at and she is willing to burn herself into a raging inferno to accomplish her goals. The question isn’t if she’ll still be alive in ten years. It’s a matter of if she will be able to help make a difference.