She certainly can. Linda exemplifies the traditional home maker of the fifties. She stays home, doesn't ask too many questions, and is unconditionally supportive of her husband. She has the requiste number of children, two, a decent home and modest income.
Women in the mid-twentieth century rarely worked outside the home, thus leaving them completley dependant on their husbands financially. Though of course many women did not fit into this category, a good number did. Without an education, limited work opportunities, and the social expectations that dicatated a "good" wife and mother was one who stayed home with her family, it is not surprising that Linda acts the way she does.
In Linda's defense, she does seem to truly love Willy and the boys. She watches out for all of them and tries to intervene in her own back-door way.