I agree. Should have used interpreter instead. Its not the matter of speaking without accent; its the matter of conveying understandable information to the audience. She would have earned a huge amount of respect if she had asked for an interpreter instead of showing off where she failed miserably.

Its a matter of nation's pride as well. You definitively do not want to have goosebumps when your there listening to her. Also, as Nalapani suggested, she did not have to deliver speech in English if she knew she would suck at it. Her attitude, overconfidence and unprofessionalism have a combined effect on this.