I like how you spent most of the piece here describing the characters situation, and then just a little hint at the end that they were trapped in some way. No elaboration needed, just a little cliffhanger to get us thinking! 😀
What would make this story richer is more description of her emotions, or what she immediately feels around her. You do a lot of telling us what has happened, but this scenario would surely be terrifying and yet the character doesn’t seem to care much. The best line was “I grew tired of fighting the pull of death” which seems like she’s resigning after a struggle, but up until that point she actually seems pretty apathetic about the fact she could die.
“(Death) didn’t come… Strange” - really?! Wouldn’t she be relieved, confused, elated? Make us care about this character! Make us relate to her, pity her, fear for her! Otherwise your interesting plot idea is futile 😆