I don’t think Amelia Bones is the kind of woman who needs to be manipulated by Dumbledore to get revenge. My similar hypothesis is that Amelia needed Dumbledore’s help to infiltrate Malfoy Manor and pull it off. Aberforth’s death provided the impetus for Dumbledore to help, but he didn’t cast the spell.
I don’t think Amelia Bones is the kind of woman who needs to be manipulated by Dumbledore to get revenge. My similar hypothesis is that Amelia needed Dumbledore’s help to infiltrate Malfoy Manor and pull it off. Aberforth’s death provided the impetus for Dumbledore to help, but he didn’t cast the spell.