Pretty sure the movie agrees she's in the wrong, the way she delivers the "that doesn't seem fair" seems to come off as her about to fuck shit up, the "if you want me to be evil, then so be it" type of character direction. Especially since we see several people condemning Strange for his mistake so her assessment is obviously off.
She'll either be the ultimate villain of the movie, or work with the evil Strange.
Oh, and in terms of Kang, he is confirmed to be in it, but I doubt they'd already have him as the main threat this soon.