I will admit I am biased with Catherine as she's slowly becoming my favorite and you can already see how her attitude has changed from where we met her to now, it's just that both of them see each other as a direct opponent rather than being on team Fletcher properly.
If you think about it they have much in common like the need for this to work to improve their personal situation. I think their punishment together, this chapter was important to begin making them see each other as a partner rather than an enemy I specially liked when they were all seating in the couch in silence after apologizing.
There's still a lot to do before they become properly team Fletcher but I also liked the detail of telling them that if they join it will have to be the both of them.
We will see by the time Hannah gets focused on how Catherine reacts when we all know all the details of what's going on with Brian, I truly believe that by then she will become a close friend for Hannah.