Would Hel survive if the Snarl destroys the world?

[Peelee]

Her getting better means she's not seconds away from death, which means nothing, the point of her fading out was to show that she is getting very bad and dying

I disagree with just about all of that. Her fading means she can't flex her powers without significant strain, not that she's seconds away from dying. Why did she get better? There's no sudden influx of souls or belief. There's no outside influence that we can see. My reading of that is the fading was to show she's exhausted, not that she's dying.