Who is C from Sarah Kane: Complete Plays and what is their importance?

In "Crave", none of the voices comprise a single character, but C seems to represented the central damaged female protagonist. C is sexually abused by her father and grandfather as a little girl. Growing up, she has abandoned both her family and the notion of human contact in general. She refuses the impassioned dedication of A. She cannot feel sexual pleasure without abuse, but by the time she wants to accept the love of A, it is too late. He has moved on. C, despairing, takes her own life.