The scherzo (3rd movement) of Robert Schumann's Symphony No.4 in D minor is discussed in the bookmark for p.13. It is Catherine's rather haphazard choice of music when she is on the verge of self-harming in chapter 1.
Listen here to the 3rd movement (scherzo) of Schumann's Symphony no. 4 on Spotify.
Listen here to the 1st movement of Schumann's Symphony no. 4 on Spotify.