What contradiction does Kristine bring up to Nora?

In Henrik Ibsen's play "A Doll's House," Kristine brings up the contradiction of Nora's seemingly perfect life and her secret struggles. While Nora appears to be living in a comfortable, idyllic domestic situation, Kristine highlights the sacrifices and deceit Nora has made to maintain that facade. This contrast reveals the underlying tensions in Nora's life, ultimately prompting her to confront her own reality and the constraints of her marriage.