What if the daughter-in-law loves to wrangle?

Daughter-in-law's love of wrangling should be a character habit, not just for you, so don't argue with her. You can take circuitous tactics, that is, avoid her sharp edge, don't argue with her when she is arguing, reason with her later, talk to her calmly, make preparations in advance, and speak with facts and reasons, so that she will be convinced and her habits will need to be gradually changed. If the daughter-in-law can't get rid of her little fault of love wrangling, she can also accept it gladly and add a little fun to her life.