6K is not good. I see it as neither a good move nor a good AutoGI. The TC isn't really reliable. The AutoGI frames are very specific (it GIs verts, BTW). It's very unsafe, but it's unreliable, as the second hit will whiff on off-axis opps, and you will eat free hits.
I find that 4B+K, while worse of a move than 6K, is a better vert AutoGI cuz of its a bigger window that allows pretty easy GI-on-reaction. If you get all three hits to connect, you get stabby hops "combos" for some nice damage.
Really, though, all of her AutoGIs are kinda crap.