Does Atom Eve Die

Eve is capable of dying, as she is dead in the realities of many of the alternate invincibles. So maybe she does outlive everyone, but then she can hang out with the immortal, and when. She doesn't actually die though. She gets close to death which allows her to manipulate organic matter. Hence, why she rejuvenates herself.

You're broadly correct that she should be the most powerful superhero in the setting, and she probably is, but there are a couple hard limits on her powers. Unless she's extremely close to.