Although she has had a descent amount of screen time, this season has been as void of characterisation for Arya as it has for Sansa. Both girls have had the developments in their stories and personalities removed. Ayra became the ghost in Harrenhal and Weasel Soup and her killing a Guard and basically manipulating Gendry and Hot Pie to leave with her, were huge steps in her development. They have been completely removed and it now appears that she just has saviours who swoop in and rescue her (the scene where Tywin works out she's a girl and makes her the cupbearer for example). Arya has been saved by Yoren etc, but she also used her initiative in Harrenhal and it developed her personality.
correct, dont you know that being a victim and classic princess needing rescue makes for a perfect ninja