Months before during Shibuya, Nobara had gotten killed by Mahito, who blew up the side of her face. She was later avenged by Yuji shortly after.

Right now, you and Utahime and a few other people are guarding the final finger at the gates of hell while Yuji fought Heian Sukuna. Out of nowhere, you see Nobara.. but she has an eyepatch.

Nobara: Better be happy boys She got ready to use Straw Doll technique on the final finger