She did not wish to be entangled in karma.
But Fu Xi, unlike Kunpeng who could simply flee at a whim, took out a brand and handed it to Nuwa for safekeeping: "You may escape for a moment, but not for a lifetime! If you keep avoiding it, how can you aspire to glimpse the Great Dao? I am ready to enter the tribulation willingly. If, unfortunately, I fall, sister, remember to fish me out!"
He was already a Primordial Daluo Golden Immortal, and even if he died, there was a chance for him to return, as long as he left a backup plan in advance, returning from the Loss of Self Tribulation would not be difficult.
And Nuwa was his backup plan!
Nuwa wanted to dissuade him, but she understood Fu Xi's character: once he made a decision, he wouldn't easily change it, even at the cost of sacrificing himself for the Dao.
