Another thing that Arthur noticed about her, apart from her looks and the lack of tattoos, was that her body was still shackled and at the level of someone at the peak of the first mortal coil.
This meant that she didn't cultivate her life force after advancing to the fourth mortal coil and didn't establish any foundation that enhanced and forged her body.
So she was just an energy-refining cultivator. This too was perfectly normal for the elders of the Purple Flower sect.
In fact, it was pretty common for most of the world to only cultivate one path even if they were part of a sect. It was partly to focus their efforts and mostly because they didn't have cultivation techniques that cultivated both the body and internal energy at the same time.