What role does the wali (guardian) play after a woman is married?

There's a strong emphasis on a woman's wali (guardian) during marriage, and when selecting a husband. However, it seems the role of the wali disappears after she is married. In a sense, the husband becomes her guardian, but not in the sense that her husband becomes her "wali" (if I understand correctly). **Question**: What role does the wali (guardian) play after a woman is married?