In her statement, Katie said her loss felt like the family had “been handed a life sentence”, and would “never stop loving and missing our beautiful girl”.
“The UK is facing an epidemic of knife crime, and cases like this only leave families wondering what consequences truly exist. Something has to change,” she wrote.
“What does it teach people when a child can lose her life in such a horrific and senseless way, yet nobody is held accountable?
“[Aria] had her whole life ahead of her. She should be making memories, laughing with her family, growing up and chasing her dreams.
“We will carry this grief, heartbreak, and loss for the rest of our lives. Meanwhile, the person responsible walks free.
“We will never stop speaking Aria’s name. We will never stop fighting for justice.”