Well...if you didn't have to hold it, she would run forever. I guess the "proper" notation would be 6[6] lol. Full runs for a charged 214A too, by the way, but you'll use that less. It does a whole lot of guard bar damage, but is still negative on guard and pretty hard to combo off of on it. By this I mean the fully charged version. 214C is the flashless overhead, no run there, and you have to cancel that into an EX or IH to combo after it.
Uncharged Full 214B comes out surprisingly fast, allowing you to link to it after a 6C in certain spacing/combos.