 Robert 's fiancee . Once Giselle falls in love with Robert , she falls for and leaves with Edward . Menzel , who is well known for her Broadway musical roles in Wicked ( whose composer , Stephen Schwartz , wrote the lyrics to the film 's songs ) and Rent , was offered the role of Nancy Tremaine . Since the role did not require any singing , Menzel said in an interview that " it was a compliment to be asked to just be hired on her acting talents alone . " Nancy is a fashion designer and Robert 's girlfriend . She is named after Lady Tremaine , the stepmother from Cinderella . Menzel went on to play a Disney Princess : Elsa , the Snow Queen in Frozen , during which she worked with director Chris Buck , who previously directed Tarzan with Lima in 1999 . 
