[quote=@Lugubrious]
<Snipped quote by Hantu Kongkek>

You have it.

Lady kicked little demons' asses.  She was a joke to Dante when she tried to fight him.

[@IncredibleBee] Tickler isn't all that young (being about 20) but I assume your wording was relativistic, right?
[/quote]

Lady fought past everything in the Temen-ni-Gru save for Arkham and Vergil, and was a late-game boss fight.

Furthermore, if we account for DMC4SE, she is perfectly capable of fighting boss level demons, Dante, and a Sparda-empowered demon pope. In fact, her playstyle is pretty much an enhanced Gunslinger style Dante, and KA packs a few moves unavailable to Dante when he used it in DMC3.