How does Linda change through out Death of a Salesmen?

It's not entirely clear that Linda Loman changes all that much. All throughout the play, she acts as Willy's enabler: protecting him, his fantasies, and his delusions from the harsh intrusion of reality. At no point does she ever confront Willy about his suicidal tendencies; she seems to think that the best way for Willy's mental health to improve is through his sons striving hard for success.
Her whole world revolves around Willy, and she puts her husband's needs ahead of her own and her sons' every single time. The quintessential 50s housewife, Linda is loyal, patient, and submissive to her husband. Only she acts more like a mother than a wife, and therein lies the problem. Willy doesn't need a mother, doesn't need to be coddled; he needs someone to shake some sense into him, to get him to see that his current path can only lead to destruction for himself and sadness for those left behind. Linda is not that someone. Her inability to change rubs off on her husband, with fatal consequences.