I love all the Shrek films and stories. If the musical is true to the first Shrek film, ~Amanda should have been dressed in her 'Orgre' character, after all the real love story is that Princess Fiona turns into a Lady Orgre and the love song is about their true love.
(In hindsight, maybe there was not enough time for Amanda to change into her proper orgre costume, and I would really love to see the Musical - sorry for being so pedantic).