High Se, very organic and natural use of it since the beginning. I saw also typings of her as an introvert. I personally don’t think of her as an introvert. Since the beginning (while she was still quite young) she is always roaming around, ‚going places‘ and what I mean is, it’s like she always has this massive input via Se. Like she is not building up some sort of introverted rationale/perception of the world first. She grabs Se from the get go. I think EP kind of fits. Wherever she ends up, she kinda gets her ass out, she always kinda gets along. She reacts quickly to new upcoming circumstances. I think she is an Fi ego and not an Ti ego, because she has some knee jerk reactions, where you kind of feel, you are crossing her feeling rationale - this is not right. She also vibes like she prefers to grab quick facts of a situation, that seem kind of more directive – getting to the goal, than building up a introverted logic system, where you just have her utter snippets of it here and there.
Another example of her Se. I think that was when they arrived at Harrenhal and Tywin Lannister spots her. She was actually running away after Ned Starks beheading, trying to fool people that shes a boy. Tywin sees, that shes not one and Arya is like ‚it’s safer that way‘ and Tywin is like ‚smart‘, like he has an instant sort of respect/liking for her, because of her idk - maybe not the best word... ‚street smarts‘. From the books it’s also mentioned how she always had a good natural understanding with Jon. Jon, who also gave her ‚needle‘ (a sword), before he goes off to the Nigths Watch. Arya remembers it later in the books, thinking of Jon and how ‚needle‘ is Jons smile.