Ppl overreacting, no chance she is dead, just adding some drama so MC will somehow burst with strength and stop all the fight. She was the most popular girl in the voting, the author would be an idiot killing her.
Now this is a proper "strong ladies" fight, definitely is shounen sasuga.
Given a gender swap all the parties involved and it is familiar, if not, exactly that of most fight story plots.
Awesome ladies that stand on their own, even the hesitation tenka showed for her "sister-in-law" when she should have finished her off, incapacitate and not kill, was really great.