A nascent soul cultivator should have an advantage in sneaking compared to a golden core cultivator.
So if she considered the difference in their cultivation level when they both sneaked into the Purple Flower sect to be relevant, this would reduce the value of her achievement.
Since she couldn't have that happen, she ignored the difference in their cultivation level.
She even said, "In fact, his weaker cultivation probably made sneaking past their defenses easier since he had a much smaller presence and would be more difficult to notice than a large and powerful nascent soul cultivator like me."
She also didn't consider the fact that she had used someone as a distraction in order to sneak into the Purple Flower sect while Sword Flash had disabled the formations to be relevant.
