When did eleonor magdalene of the palatinate-neuburg become duchess?
CREATE TABLE "house_of_habsburg_1653_1722" (
  "name" text,
  "birth" text,
  "marriage" text,
  "became_duchess" text,
  "ceased_to_be_duchess" text,
  "death" text,
  "spouse" text
);
SELECT "became_duchess" FROM "house_of_habsburg_1653_1722" WHERE "name"='eleonor magdalene of the palatinate-neuburg';