What do you mean they didn't have any development? Taylor, Miranda, Olive, Aurora, Elsa... They all had great development in their relationships with MC. Aurora went from the bully who everyone hates to the lovestruck girl who put her whole career in line for MC and can't stop wanting to be near him all the time. Taylor opened up about her trauma, something she had only told Samara, to MC and is comfortable in being vulnerable to him. Elsa is basically risking her job and career. Miranda trusted MC with who she is and opened up to him about her condition, which in turn she was happy to see how he accept her and even started learning sign language to be able to speak with her. Olive went from the shy girl who was secretly taking pictures of everyone because she can barely talk to anyone, to someone who is able to assert herself at times and make friends.
Even Danielle and Samara had some development. The only ones who barely had any or didn't have any at all are Sana and Rose.
I do agree that she have the background with MC, so she doesn't need as much development in that area as the others, but still 4 episodes in already ffs. Even if slow, she should've been getting SOME kind of development in a direction to a romance.