Dungeon girl Kerstin Fritzl ripped out her hair in anguish during her ordeal, it was revealed yesterday.
Kerstin, 19, also stuffed clothes down the toilet in protest at being imprisoned by evil father Josef Fritzl.
Her anger and frustration is documented by police in evidence being prepared against the 74-year-old.
He admits repeatedly raping his daughter Elisabeth, 42, who bore him seven children - including Kerstin - during her 24 years locked up beneath the family's home in Amstetten, Austria.
Elisabeth, who is with them in a clinic, has given video evidence to avoid attending Fritzl's trial later this year. Police have to decide if they need the children's evidence.
