The comparisons between the Attributes mentioned in their Statuses already gave Ketis a powerful indication that she was a lot weaker than Ves.
Studying their respective Divine Cores only worsened her evaluation of herself.
The three Divine Cores belonging to Ves were all strong and clearly defined without exception.
While a part of that could be explained by the fact that he was older and had more time to figure out his goals and motivations, he was being a lot more productive than Ketis.
What Ketis found ridiculous was that Ves 'accidentally' managed to become a phase lord somehow and become a lot stronger than herself!
Even though the two had never sparred against each other for real, Ketis could already tell without a shadow of a doubt that she could swing her blade against Ves' massive true body all day and still fail to kill him entirely.
His body was too big!
His skin and hide were too tough!