she strangely used that flame to create a gun and revenge Claudio. Hibari explains that anyone can have different hados but only some of them are actually used. A hado can be inherited or created by mind and resolution. He explains that she created that hado with the desire to make real something unreal (probably Vongola Primo) and was able to use the flame due to the strong shock caused by Claudio's death, with her consequent strong desire to have a weapon to avenge him.