Of all the conclusion that push Nodame to go missing, I never imagine because she egotistical and small-minded in some innocent way. But I also love how in a way she was being an unreliable narrator since she experienced impulsive acts without understanding her own actions. To struggle on giving better performance than before is something that can be scary. However, just as Chiaki fell in love with her piano playing, Nodame fell in love with his musical sense and talent. So it is an appropriate solution to keep Nodame motivated in a precarious industry.