Warning: We'll be pulling a lot from the manga, so anime-only fans should beware of possible big spoilers.
Much like her other fellow Upper-Rank Demons, thanks to Muzan's blood, Daki already has incredible strength, regeneration, and speed that is leagues above any regular demon. Besides those powers, she's also got a few abilities that make her such a dangerous offensive and defensive threat. Daki's Demon Blood Art ability is Obi Sash Manipulation. Via Crunchyroll, in Episode 4 of the latest arc of "Demon Slayer," we see this deadly art on display, as Daki can create flower-patterned sashes from her flesh that are hard enough to severely hit Tanjiro, yet fast enough to miss in the blink of an eye.
During her battle with Tanjiro in manga chapter 81 (via Viz), we see that Daki can surround herself in a flurry of sashes, and she attacks from a distance. But the end of the manga chapter reveals one of the ability's biggest surprises. As Tanjiro manages to get close enough to cut her head off, Daki transforms her neck into a sash, and it takes on a fabric-like quality that makes it near impossible for the demon slayer to cut. So not only can she transform any part of her body into the sash, but they can also take on properties soft enough to make it hard to cut. In addition to attacking and defending, as we see for poor Zenitsu in the latest arc's Episode 3 (via Crunchyroll), they can also capture people. And in the following episode with the Oiran, the sashes can also absorb people.
