Can't say I particularly care about saving her, but I do agree it should at least be an option.
Maybe even an impractical and demanding one, where the conditions to intervene at the right moment are particularly hard to fulfill (i.e. extremely hard skill check, difficult roll, etc), but still, something that should at least be possible.
Realistically speaking I think the time for adding and modifying significant story content in this game is gone, but it's at least worth pointing it out for the sake of future productions.
I think, you could make it similar to the guy in the goblin camp, that gets pushed into the spider pit. You have to time it right and stop the goblins from doing anything, attacking them doesn't save him.
So casting Hold Person on Nere right after the explosion and before he gets his cutscene for example .
I'm sad for Meerna tbh, but I think that scene just drives home that the Underdark is a cold and unforgiving place.
