Harry Gilbertson, who is now 18, was just 14 when he stabbed the 12-year-old in Liverpool in 2021.
Leeann White also criticised some media for suggesting her daughter's case influenced the drama.
The mother of 12-year-old girl who was stabbed to death says knife crime is at "epidemic levels".
The move is part of a campaign following the stabbing murder of schoolgirl Ava White.
Ava White's mum says knife crime must "come down everywhere" ahead of the anniversary of her murder.
The 12-year-old was killed in a row over a Snapchat video in Liverpool city centre in November 2021.
Ava White was stabbed to death in Liverpool a year ago after a row over social media videos.
Leanne White says when she was told about her daughter, she thought it was a "mistake".
It is one year since the 12-year-old was stabbed to death after Liverpool's Christmas lights switch-on.
