Katrin just absorbed an artifact, not a simple artifact but a powerful one, the Righteous Inferno was a Second Rarity level artifact, in rarity it was the same as Adam's artifact.
Usually, the stronger the artifact was, the harder it was for the Phantoms to find a suitable one so that the Evolution Tree and Initial Gene would be ready to take on a new part of their owner's power.
This was one of the reasons why Operators advised their Phantoms to develop their current artifacts instead of constantly searching for new ones. Each time, as the Phantom's power increased, it became more and more difficult to do so.
Could Katrin have just gotten lucky?
Sure.
But... hardly anyone watching this scene was willing to believe that.
From her actions and detached look, Adam, Refesa, Silvana, and Magnus immediately realized that something unusual happened.
The only one who still thought Katrin was just lucky was her Operator - Alan.