I'm on the 5th episode of Season 2, but I'd say she's a clear 8w9.
In the first scene, I thought she might be a 4. She was looking longingly out into the distance, and had a look of sadness and longing about her. She was also being abused and overpowered by her brother, which said "masochism" to me.
But then I saw how she responded when she saw a way out, and had a little bit of power and control. I don't know what her other options were to escape from her brother in the beginning, but the way her character panned out, I saw clear 8ish tendencies. Her brother was envious of her (though I'd type him at CP-6, easily) ... but she did not envy her husband Drogo, nor her brother, nor men who had more power. She simply, patiently and strategically (line to 5) climbed her way to the top (8) and did so compassionately, with a very motherly, nurturing approach (line to 2).
All of the classic "symptoms" of 8 are there. She has all the connecting lines, clearly displayed; a very clear goal and motive, finds it easy to accept her power and use it, but only on HER terms. She doesn't fall into line with the ways of the tribe; instead, she makes her own rules and decides what kind of queen she wants to be, and takes it upon herself to work towards it in a goal-oriented manner. She's also direct about what she intends and what she believes. She doesn't question her instincts in those regards and displays strong gut tendencies. She also has the recklessness of an 8; she can be impulsive in terms of trusting her gut.
Her sadism shows in the way she acts towards her brother. She watches Drogo pour metal over his head, and watches him burn. Deep down, I would say she wanted revenge on him and she got it, and it gave her satisfaction. She still showed him compassion, on the surface, but the way she went about everything just showed to me that she did have that sadism underneath, where she was satisfied by being in control and watching her brother slowly lose power while her power grew. Though she did not take revenge into her own hands, I would still say that deep down, she had satisfaction at obtaining that revenge, and she felt that it was deserved. She also enacts revenge upon the woman who killed Drogo and her baby, and deceived her; but then again, who wouldn't? =p. Still, the manner in which she did it is telling. She announces that anyone who betrays her will die screaming, and that the woman will scream against her will. The woman screams and everyone sees. She smiles. This is vengeance and sadism. It's also a show of power through public shaming. It shows everyone that as compassionate and lovely as she is, if you fuck with her, you will die making a fool of yourself, screaming in front of everyone, without honor.
Also, I thought it was rather 8ish, at the end of the first season, when she stood before Drogo's corpse and told her followers that they're free to go, but if they stay, they will follow her, etc. Autonomy is an important value to an 8, and she wants people she can trust; people who believe in her and won't betray her. She gave them their autonomy; gave them a clear choice: follow me, or don't. Go free , if you don't want to. That particular approach seems 8ish because of the value in autonomy, but also, the awareness that if people are forced to follow you, they're more likely to betray you. So it was self-preservational, as well as kind and direct; and wise.
She does display naivety in some ways, but I think it's important for people not to idealize 8s in this manner. Nobody is born perfect, not 8s, not anyone. Nobody is born knowing everything. But on top of that, crucial to the make-up of the 8 is the dichotomy: Lust AND Innocence. An 8 will have lust, but also the virtue of innocence within. Innocence will be displayed when an 8 is in her prime; when an 8 has power, and plenty to spare, it's likely she'll feel that she *can* live by her ideals. 8s also have a childhood-orientation which binds the 8 to the goals, dreams, plans, and visions that the 8 had in childhood. This will register as "innocence," and any way that an 8 can bring this into her life will make her feel more healthy. Power gives the chance to enact those values. For instance, in our world, if you earn all the money you need, you can then contribute to charity, thus supporting the things that you believed in as a kid. You can make your own schedule; not worry about anyone else's rules. You can buy time to work on something you're passionate about or take lessons in something that interests you, or travel and explore, or collect your favorite childhood trinket. Also, keeping in mind that the 8's soul-child is at point 2, these childhood passions and values might easily include giving to others; displaying compassion and love for others. With autonomy, innocence can come as well, in this regard. The less an 8 fears being overpowered by others, which is the 8's basic fear, the easier it is to integrate, and to achieve the virtue of innocence.
So I would say, since power was given to her fairly early in life, and she was able to retain it and nurture it and grow it on her own terms (first Drogo listened to her and gave her sway; then, she just took over entirely, with the aid of the dragons) ... she also could stay attached to those childhood dreams and live to enact them. Dreams of kindness, better treatment for women, taking back the kingdom that is hers by right, etc. 8s who are pursuing their goals will very likely have something "innocent" about them. Also, to contribute to this innocence, is the idea that each type is influenced by the two wings around it. Between the positive-outlook connections (9 on one side, 7 on the other, and a line to 2), 8 will have a lot of influence from positive outlook types which may contribute to a more innocent look in their eyes than people may expect from the stereotypes. The 9 side will give them peace and escapism; the 7 side will give them adventure and joy; the line to 2 will give them overwhelming love for others and joy of giving, as well as pride in themselves which brings joy. A healthy 8, who is subject to all these influences, in touch with their virtue of innocence, and integrated , will have this innocent quality that some people mentioned; even while still being powerful, and strong, and firm as leaders.