-Arya turned into such a kick ass assassin.
-The hurried/unfinished feel to the story probably bodes well for Martin who can now do it properly and make a bundle of $$$ selling the real ending in his books.
did she?
In the books she hasn't, well yet.
Even in the series, she ran away from assassin school.
She wanted to be the scary tough killer but as Sandor kept saying....