The descendants of those other females are certainly still alive. Those other women left many offpsring and could well have many more surviving descendants than Eve. Many of them also had far more surviving duaghters than Eve. And more surviving granddaughters, and great graddaughters and so forth.
Imagine a simplified scenario. The are 4 people in the world: Eve, 1 other women and 2 men. Eve has one female offspring. The other two women have 4 offspring each, 2 male and 2 female. Eve’s daughter marries one of those male offspring and has 8 daughters. The other women of her generation have 2 offpring, all male. Eve’s daughters marry them. Eve is now the only common female ancestor of every family on Earth.
But you will notice that the other women alive at the same time as Eve have left also left descendants. In fact they left far more offspring than Eve did.
I really can’t stress enough that “Eve’ is COMPLETELY irrelevant to the question at hand. Her existence tells us nothing at all about minimum population sizes. You can not use her, as you are doing, as evidence that the human race can repopulate from one female because that is not what her existence tells us. You really do need to understand that at Eve was never the only woman on Earth, nor was she ever mother to all the women on Earth. It was probably only after hundreds or thousands of generations that she became ancestral to all humans. For tens of thousands of years after Eve died there were millions of women to whom she was NOT an ancestor. I really can’t stress that point enough. Eve only became ancestral to all of humanity AFTER all here descendants had mutated so much that they could no longer possibly inbreed. At the point when Eve became the common ancestor her descendants were probably no more similar to each other genetically than you are to a random man from Africa. The only genetic similarity they shared was in fact one tiny section of mitochondrial DNA. In all other respects Eve’s descendants had mutated into completely unrelated individuals.
If you took a cup of water and poured it into the ocean then after a thousand years every glass of water on Earth would contain some of the molecules found in that glass, no matter where you collected it. What you are trying to do Achilles is use that fact as proof that you can produce an ocean from one glass of water. Of course you can’t do any such thing. The glass didn’t give rise to the ocean, it just got mixed into every part of it. In exactly the same way Eve didn’t give rise to humanity, she just got mixed into every part of it.