How does Elisa and Henry's relationship change over the course of The Chrysanthemums?

In her first interaction with her husband, Elisa is a little smug with him. He compliments her work but then, somewhat dismissive, says she ought to put more work into the orchard. He has sold some cattle and offers to take her to dinner and a movie to celebrate. She is appreciative but in a pretty stoic way. She reacts nonchalantly and simply says "Oh, yes. That will be good." There is some subtle but clear tension between the two of them and some resentment on her part. But Henry doesn't take notice of it. 

Elisa is fascinated by the stranger's way of life. It awakens some repressed feelings in her. She tries to describe her method of planting. She attempts to describe it in terms of the stranger's way of life: 

I've never lived as you do, but I know what you mean. When the night is dark—why, the stars are sharp-pointed, and there's quiet. Why, you rise up and up! Every pointed star gets driven into your body. It's like that. Hot and sharp and—lovely. 

There is a sensuality in this description. Note the words such as "hot," "lovely," and "body." It is unlikely that she is instigating any notions of an affair with this man. But she does use this moment as a way to express some repressed desires. This shows that she does not get that kind of affection and romance from her husband. So, the smugness noted earlier is a result of that. 

She is meticulous in bathing and getting ready to go out with Henry. When he returns, he says she looks "nice." Undoubtedly hoping for something more complimentary, she interrogates him about the comment. He says she looks strong and happy. She adds "I never knew before how strong." She is referring to the strength she has had in enduring a bland marriage with Henry.

This was made clear by the excitement she got from that brief encounter with the stranger. The story ends with her hiding her tears from Henry. She is hiding her anger and sorrow in order to keep the marriage as it was. So, she is attempting to keep things the same. In that respect, nothing has changed. However, this may be the first time that her repressed feelings have erupted in an outward way (crying). So, if anything has changed, it is that she has come to realize how strong she has been in repressing her feelings. It doesn't seem that Henry grasps this at all. So, for him, nothing has changed.