"a woman feels that she always needs to act cheerful and look her best when her husband gets home from work, because he has a stressful job and he needs her to unwind. we would say this woman is: "

The woman is taking on the expressive role in the relationship. This sort of person looks out for the emotions of others and makes sure that everyone gets along and that conflicts are negated. This is in comparison to the instrumental role, which is undertaken by the person who looks to complete the tasks that the group needs to accomplish.