Before the season started? How would you know then?
But seriously, she may be irritated but since that is no minor point but a crucial one I think they should have made that clear to the audience. There wasn't any dialogue or so to support that - and I recall her vividly saying multiple times that there is nobody that could resist his powers (inlcuding her) up until episode 9 or 10. Sorry, but the way they showed it makes her look stupid imo (unnecessarily!) since you aren't 100% mind controlled all the time but at one point (why? remains a total mystery = bad writing) you just decide to walk away while being told to stay and that's it: "Whoa, that was strange.. *shrugs* .. must have been a fluke better not think about that anymore"
What indeed is made clear are the reasons that she points out to be the only one who can approach him:
a) because she want's to save the others of facing him so to not endager them (sth. she completely fails at)
b) because she knows that he is obsessed by her.
Anyway, for me that whole thing is a cop-out. If that's the way she's depicted in the comics (being resistant to his powers): ok, should have been written in the TV series better then. If not: I think it'd be way more interesting (and fitting the noir-flair) to have a "super-hero" who isn't able to face his arch-villain on the same super-level but to think of a different way to outsmart him - hence rendering his super-powers rather useless. Would be very fitting for JJ since she isn't your typical super-dude in a suit (like DD is for example).
And please don't get me wrong: I don't want to lessen your enjoyment of the show one bit. It's basically my frustration speaking because the premise was fantastic, the rest totally delivers but these imo unecessary decisions take away what could have been so much more.
No problem.
I'll clarify, if I understood you correctly, you said about episode 9 she knew she could resist Killgrave? I pointed out that the period of time where he had control of her, where he ordered her to "take care" of someone, and where she first walked away from him, took place before Episode 1. She does not know why, just that it happened, but she still feared him because she did not know if she is truly free of his power. No problem for me.