Indeed, in A Doll's House women are usually portrayed in a sacrificial role. First, Nora sacrificed herself to save BOTH her father and her husband. Ms. Linde sacrificed herself for her husband and children, and it seems to go on and on.
While Nora played her "lark" and "squirrel" roles in the household and explained to Mrs. Linde her actual role in the recovery of her father and, eventually, her husband in Italy, she was not even understood by Ms. Linde. Even as a woman, Mrs, Linde could not conceptualize Nora's sacrifice.
The idea behind this is that, according to Ibsen, women have expected societal roles. Linde would be a sacrificial lamb, and so will be Nora.
In conclusion: Women in the play ARE second-class citizens who would not never get the benefit of the doubt even when their sacrifices are worth people's admiration.