Vela is an eldritch entity, and she in particular is not life as we know it, no cells, she is energy with will in a membrane and some of that energy manifests into tools inside her energy, like the sprites that break down tough material, and swim around in the energy, and she has other structured things she manifests inside herself as needed. She has no proper reproduction, and is not driven by chemistry, to her a rock and a baked potato of same mass has roughly same energy/nutritional content, not that she strictly actually needs nutrients either, she is just hungry. Eldritch entities do not really have to make sense to humans
So to Vela she sees herself as separate from life in the universe even if she can create life that connects to her that she can then use as fingers and senses in the universe, and she can even pretend to be microbes, but she is not a microbe, or a human, or fey, or plant, or mushroom, or anything like that, so to her life looks very different from what she herself is. Back in the far realm there are other entities like her, but also some closer to life in the universe, beings in the far realm can be manifestations of some specific concept/thing, like hunger, or even more complicated than that, like take the ideas of Lovecraft, but actually take them further
One thing I toy with in this story though is that our universe and us is as alien to those entities as they are to us. Most people would be revolted by almost anything from the far realm, and want to destroy it, and that is true the other way around, or if not destroy us then maybe existence itself, as the very foundations of reality we rely on can be disgusting and painful to them, and feel extremely wrong to them.
Now when it comes to immortal life she already knows a few ways to make some person last forever, the star elves knew ways to do that, but most of those are not what she wants to do, like creating intelligent undead, those can outlast the living easily, but they do not reproduce and she has understood from eating living things that reproducing is important, down at the most basic level, so to her that is important to preserve.
Vela does with help in the future set up a place that can handle immortal beings reproducing like rabbits, or even like bacteria, without running out of space and resources, but the truth is that that place kind of is no longer reality as we know it, but altered on a fundamental level with magic, mostly driven by her own nature, to her any energy can just be absorbed and restructured, and entropy is just what happens if you let it, statistically speaking do its thing.
Vela is Vela, she is not one of my many other beings
It will take me longer than this forum will remain up to get to some things that I have in my head, so hopefully I figure out where I am comfortable sharing the story for those who want to keep reading it.