User blog comment:Xilinoc/Ch. 571 (Yachiru's gonna wreck it)/@comment-2211792-20140305115549/@comment-5693502-20140305150759

It's a melee ability. Melee abilities are applicable in almost any situation. Unless of course you're fighting someone wielding powers like Zanka no Tachi.

Sure it seems favourable for this situation, but she is on the side of good. Luck seems to swing to the side of good (or at least popular characters) a hell of a lot in shounen.