What happened to Yisha (han sen's teacher/knife queen)

I just read the chapter where the rebate kings and elders said that she died but she can die right. From what I remember I read a spoiler where han sen challenges buddha race for lamp and Yisha was shown in that chapter, so i dont get it how did she die.

Pls anyone tell me, I am dying to know. I don't mind if you spoil me about the whole thing but pls tell me how she died and came back alive.