She said she felt like her “passion” for dance had been lost, but she had “tried not to let him take that from me” and is slowly “learning to love” dancing again.
C6 told the inquiry she now feels “different” to everybody else, including some other survivors, and recovery is “lonely”.
“I feel under so much pressure, like I am stuck between two worlds,” she said.
“I don’t fit with the adults there that day, or with those younger than me. I am somewhere in the middle.”
C6 said the inquiry “has to tell us why this happened” and find out why the attacker “was not stopped”.
“Why did the agencies involved not speak to each other?” she asked.
“How many others are out there like him? This can’t happen again.”
Inquiry chairman Sir Adrian Fulford praised the girl for her contribution, telling her: “Very well and bravely done.”
Earlier the parents of two children who survived the attack without physical injuries, referred to as child V and child W, described how their girls initially believed a man had come into the studio with “a fake knife and fake blood”.
The youngest told their mother: “Mummy, he didn’t knock on the door, he didn’t ask to come in and nobody wanted him there.”
Their father, his voice breaking with emotion, told the inquiry: “This Inquiry matters.
“It matters for our children, and for every child who was there that day. It matters for every parent who has sat up at night, terrified, knowing how close they came to losing their child.
“And it matters for those who did lose their children, who we think about and carry in our hearts every single day.”