Gwyn isn’t who she wants her to be, and that’s not okay. Reese needs a rude wake-up call, and to realize that people are people with their own agencies. It’s okay if the person you idolized has flaws. But coming to terms with this can be hard. Maybe she can blow up at Gwyn for not being the person she wanted.
In turn, Gwyn needs to realize that Reese used to idolize her, so that she can better understand her shallow behaviors. Her own past isn’t an excuse to judge other people right off the bat. So, when Reese fights her on this, Gwyn needs to give Reese her wake up call, and Reese needs to give her a wake up call on that front.
Using this, they both have something to offer one another emotionally, which is really what creates the foundation for a friendship. But… I would say that maybe I would try to find things about both of them that they notice and can respect about one another. Otherwise, their relationship isn’t going to go far. Maybe show Reese having a deeper moment, or a deeper more empathetic view of something than Gwyn so Gwyn can appreciate that from her. In turn, something that Gwyn does could show Reese that, why she may not appreciate her current situation, she’s not incapable of appreciating past experiences and kindness offered by others.
Highlighting the good qualities in one another before the big blow out may lead them to become friends later on. But I feel you should establish at least a shred of respect for one another before having them become friends. Otherwise, the friendship will feel forced.
Maybe put them in a forced situation together where they have to sort some things out on a civil front. This exercise, why physical, could metaphorically highlight some of the misinterpretations and behaviors they have for one another. While at the same time, it highlights their good qualities and things they can find in one another to eventually grow to respect.