Who is mrs. hay in doll's house?

In Henrik Ibsen's play "A Doll's House," Mrs. Christina Linde is a close friend of Nora Helmer. She is a widow who reconnects with Nora after many years, sharing her own story of sacrifice and hardship. Mrs. Linde represents a foil to Nora, highlighting the complexities of marriage and societal expectations for women in the 19th century.