Elizabeth shows her love for her husband in a variety of ways. Her lying on the stand is done in the belief that it will protect him. Additionally, her pleading with him to sign the false confession reflects an absolute love and devotion to John. She asks him to lie so that he can live. At the same time, when he pleads with her to accept his desire to tell the truth and refrain from signing the confession, she ends up understanding. With this action, she demonstrates complete love and loyalty to her husband for while she knows he will die, she understands the importance for him to stand for his name, to die with dignity for standing for the truth. This evolution in her and willingness to support her husband reflects absolute loyalty and devotion even if it comes at the cost of her own happiness.
To me, the thing that Elizabeth Proctor does that best shows that she loves her husband John is when she lets him die at the end of the play.
This seems kind of weird to say that -- that she loves him so she lets him die, but here's why I think that. John has been miserable for a while. He has felt guilty and he has felt like he is not a good person. At the end of the play, she lets him die because he now has his good name and his feeling that he is a good person. She does not want to take that away from him.
To me, this shows love -- she does not want to do something that will take away his feeling of being a good person.
Elizabeth Proctor demonstrates her love for her husband by standing up for him even though he had cheated on her with Abigail and lied to her about his actions. She could have turned him in for his sin, but she does not. Instead, she is willing to die and lie for her husband's sake than to tell the truth and risk his life.
"Elizabeth: My husband is a good and righteous man. He is never drunk as some are, nor wastin' his time at the shovelboard, but always his work."(104)
Elizabeth regrets her own time that she spent with John and that she had acted as a cold wife. She cries and asks him for his forgiveness. Goody Proctor is the essence of what love should be.