Doctors have revealed how the teenage daughter of Austrian rapist Josef Fritzl said "hello" to them as she was woken from a coma - and later said she wants to go to a Robbie Williams gig.
Kerstin was unconscious and critically ill when admitted to hospital on April 19 and placed on a life support machine.
She was put in a medically-induced coma and has now been successfully revived.
At a news conference in Amstetten, Austria, doctors said her recovery had been surprising and "a great relief". There should be no major lasting damage.
Kerstin, 19, was the eldest of seven children fathered by Fritzl, 73, and his daughter Elisabeth, who was imprisoned in a dungeon underneath the family home in Amstetten for 24 years.
"She opened her eyes and showed emotions for the first time, we laughed and she laughed," said Amstetten hospital chief Albert Reiter, adding that Elisabeth Fritzl was able to quickly visit her daughter.
"It was important that the mother came to her daughter's bedside," said Mr Reiter, noting the hospital had managed to keep these visits hidden from the media.
Doctors revealed how they had created a flat for the family where they could live a normal life. Three teachers are providing the children with lessons.
Kerstin is having therapy to rebuild her emotional and physical strength. She has been taking steps accompanied by her mother.
She can read and write and has expressed the desire to go on a boat and to see a Robbie Williams concert.
Mr Reiter said: "Even three days before her breathing apparatus was removed she was lying there almost dancing in her bed listening to Robbie Williams, so for me that was really the time when we (decided to) force through the mobilisation."
Kerstin had spent her entire life in the windowless cellar with her mum, now aged 42, and two brothers.
Three of her other siblings lived "normal" lives as Fritzl's "grandchildren" while another child died shortly after birth.
Doctors told reporters the family's reunion had been "a wonderful coming together - beautiful to see".
Kerstin's admission to hospital lifted the lid on the 'House of Horrors' abuse scandal.
Her mother and siblings are currently staying at a nearby psychiatric clinic.
Fritzl, who remains in custody pending charges, had confessed to the abuse, police have said.
Sky News