Sophie Parkinson, 13, was found dead at her home in Liff, near Dundee, on Saturday. Her mother Ruth, 42, said suggestions that she had been bullied were "an insult" to those who have been victims of bullying.
She said: "I don't have any answers to why it happened and I want answers - that wasn't the Sophie I knew. The Sophie I knew was the girl I was lying with the night before, stroking her hair and chatting to. She was a happy girl but she must have had such deep-seated issues.
"I know she was very well loved. It's such a tragic waste. I think she was too sensitive to the world and she got hurt by the world."
She praised Sophie's school, family friends and neighbours for their support.