OK, I've binge-watched season 1 several times now since it's release on BD. I have to say that the anime pace and what is included/left out gives me a different take on Catarina vs. Katarina.
The actions of Catarina are more like, "Oh yes, this is a death flag! I have to do something about it," but then she acts just like her original incarnation in Japan... Friendly towards everyone around her, not changing her (previous life's) behavior. Even falling on Keith had a precedent in falling out of a tree onto A-chan.
Maybe it's just how compressed things are in the anime. Guess I'll have to re-read the novels again at a similar pace.