A woman who killed her lover with an axe told a jury yesterday she believed she had done "the right thing".Janet Charlton, 36, said there was no other way of saving either herself or her four-year-old daughter Amy from the violence of Danny O'Brien."I thought he was an animal," Charlton told Leeds Crown Court. "He was mad. He would have done absolutely anything. I believe he was mentally unstable."Charlton, who was giving evidence for the sixth day, said: "I have to live with this for the rest of my life. I know that the only reason I can is because...