VISTA — The aunt of Carlsbad woman accused in a failed murder-for-hire plot testified in a Vista courtroom Monday that her niece had once asked if she knew someone who would scare or kill her estranged husband. The alleged conversation, perhaps a year or so before the niece’s husband was shot by a sniper, began when the niece, Diana Lovejoy, told her aunt how frightened she was of her husband, and that she suspected he was abusing their son. “She said ‘Aunt Diana, do you know anyone who could do that, either scare him or kill him?’” Diana Clark said.