Greed was apparent in the wereserpent's voice. Clearly, she just wanted her hands on whatever power Elora used to escape from that helicopter while wearing a restricting band. Not to mention the girl with darkness affinity.
Actually, Aria was quite upset that she had failed to snatch up the Ashcroft brat when she was still living in the UK. Unfortunately for her, news travelled slowly before the council's formation, and Aria had her base of operations in the Northern parts of the country.
Sure, she had heard rumours about some Witch of London, but never enough to make her take notice. Not until the council formed and started to asses any internal threats, that is.
It was Zara's warm and motherly voice that responded to Aria's outburst. "Now, now, Aria, dear. Let's not lose our heads."