@bakauguu Yes it is, but she doesn't want the MC to be involved. This is dumb as hell because she literally cannot hit the monsters on her own, the only way she can hit them is to aim at the MC and hope that the misses wind up hitting the monster. There's no point for her to go into the dungeon by herself unless she's planning to commit suicide.
Since she performed an unacceptable display of intelligence, when she proposed to retreat, she has now to balance it out with something painfully stupid, in order to maintain her status of braindead bigtitted waifu.
I'm kind of hoping that this manga will pull something that no other isekai ever had the balls to do, in that the big titted blond elf girl actually ends up dying from her stupidity. Actual consequences for stupid actions and bad decisions would certainly be a novel idea that could help elevate the entire genre.
@Bluehammer12
It's not really novel. There's at least one isekai story adapted into anime that has that sort of tone (harsh reality, nobody is overpowered), but I'll refrain from mentioning the title to avoid spoiling it (and because I forgot the title).
A decent amount of plot armor is important for an enjoyable story. I personally didn't enjoy the stories that were based on DnD sessions of the writer(s) where important-looking characters die with no buildup nor any tropes played. You know your character can die within an hour into the session due to one bad dice roll and it's no fun. Furthermore, if that manga/anime character was revived, or if another important character dies, then any following deaths would feel less impactful.
Not sure why you would expect that of this specific manga and not any of the others with more developed characters whose deaths would have a larger impact.