sentences:  Between 1993 and 1999, she appeared at Bayreuth as Isolde in "Tristan und Isolde" staged by Heiner Müller and conducted by Daniel Barenboim.In 1998 she added additional dramatic soprano roles, debuting as Leonore in "Fidelio" with the Chicago Symphony Orchestra, again under the direction of Barenboim, and also appearing as Ortrud in a new "Lohengrin" production at the Bavarian State Opera.In 2000, Meier appeared again at Bayreuth, performing the role of Sieglinde in "Die Walküre" in the "Millennium Ring" at the 2000 festival staged by Jürgen Flimm and conducted by Giuseppe Sinopoli with Plácido Domingo.