She is a dark-eyed young lady, still plump with baby fat. She is proud and boastful, though not particularly quick-witted.
Several months before reaching the age of majority (16) her guardian, mentor, and uncle, Arendor Haevin, declared that she was as ready as she would ever be to assume the role of High Seat of House Haevin. She took this as a compliment, rather than as the insult it was.
She walks into a meeting with Elayne and Dyelin, who are discussing the fate of the five other Houses who are planning to stay neutral until a victor is decided.
After Elayne's capture, a soldier arrives with the news that some mercenaries had betrayed them, and were attacking the Far Madding Gate from the inside. Catalyn wishes to accompany the force that rescues Elayne, but is instead sent by Birgitte Silverbow and Dyelin Taravin with her armsmen to secure the gate, along with Perival Mantear, Branlet Gilyard, and Conail Northan. Arymilla Marne's army attack the gate but is hit behind by the recently rescued Elayne and her force. Arymilla's army soon surrenders.
She is present at the meeting with the neutral High Seats and Elayne. There, they throw their support behind Elayne giving her the required Houses she needs to obtain the Lion Throne.