Despite suffering stab wounds to her spine, head, ribs, lung and shoulder blade, Ms Lucas managed to get herself and several children out of the room and call the police.
Rudakubana - who was jailed for a minimum of 52 years in January - attempted to murder eight other children, who cannot be named for legal reasons, as well as businessman John Hayes and Ms Lucas.
Leanne Lucas was overseeing a Taylor Swift-themed dance class in the Merseyside town on July 29 last year, when Axel Rudakubana, then 17, entered the building and started attacking children and adults.
Fourteen-year-old Sarah — a fellow survivor whose identity is protected by a court order — also spoke to the programme, telling the BBC of how she managed to fight through serious injury to lead several of the children to safety.
More children would have died in the attack if Ms Lucas and Sarah had not taken the action that they did.
