Would Hel survive if the Snarl destroys the world?

[KorvinStarmast]

My thoughts are that the dangers of divine starvation apply only to ascended gods, and that belief alone is sufficient to save Hel. As long as enough people know of her existence, she will survive. Hungry and wane, but won't fully fade. And it is hard to not believe in Death.

Even those who disbelieve in death will still die.

For the OP: Oots is not the story of how the world will be destroyed. In other words, you answered your own question. Whatever might happen to Hel would happen off screen, and necessarily be part of a different story.