CREATE TABLE table_16569 ("Character" TEXT, "Portrayed by" TEXT, "First appearance" TEXT, "Last appearance" TEXT, "Duration" TEXT, "Episodes" TEXT)

On which episode did actress Sela Ward make her last appearance?
SELECT "Last appearance" FROM table_16569 WHERE "Portrayed by" = 'Sela Ward'
SELECT "Last appearance" FROM "table_16569" WHERE "Portrayed by" = 'Sela Ward'