That's because this is something she does. Makima never fights against an opponent without a plan unless she underestimates their abilities (as was the case with the Blood Devil). However, that situation was unique because Makima knew Power and, mid battle, used specific tools from her arsenal to turn the odds in her favor (because Power had shown off her limited skilletry). Yet, she didn’t control the Blood Devil right away, either because she respected her Awakened abilities or simply saw her as a hindrance rather than a necessity as her goal in that fery momment was to re-claim the fallen Chainsaw Devil. Aside from those mere 10 seconds of the initial battle, every major battle Makima has participated in (20% Gun, Yakuza attack, Awakened Pochita) has been planned in advance. In the rare moments where she didn’t plan ahead (such as D-EMP Santa), she left to one of her capable troops, like Denji.