Question

What chapter does nobara die?

Answer 1

Her status is still unknown. Most likely, the author just gave a" seed " with her death to make the plot more interesting. While Nobara is still in limbo, we don't know 100% if she's dead.

Answer 2

Didn't Brother Todo delay her death? In theory, he could take Nobara to Shoko, and she could reverse the technique. It's possible that Kugisaki is in a coma right now, but when Itadori asked Fushiguro about Nobara, the other one didn't say anything, so I can't say for sure.