Mwe's Arc in Detail:
It's told in a series of flashbacks. First is Mwe at the age of 9 when she first auditions for Ruby and impresses her with her voice though she cannot dance. Second is Mwe at 13 as they are drilling her on being perfect with her dance moves and how she's not working hard enough. Third is Mwe at the age of 18 or 19 when she has been performing but has not really taken off and confronts Ruby about looking to replace her culminating in Mwe giving the break out performance of her career that turns her into a star. Forth is a flash back to a few months before the NY concert where she is now dating her childhood friend, a music teacher from her hometown. She laments that she can't be free to sing what she wants and be who she wants. The last flashback takes us to a week before the concert where she is nearing the breaking point (this scene is more about Rtmis then Mwe). Then in the present, Mwe snaps while performing her number in rehearsal and we see inside her dressing room via the documentary cameras that she can't deal with the stress anymore. Ultimately, Ruby tries to get her to stay the course and stay a superstar while her boyfriend wants her to give it all up and move back home with him. She doesn't want either. She wants something in between the two. She doesn't want to give up being a singer, but she doesn't want to be as big as she currently is. So she makes the choice to leave the label and find a new path for herself. She and her boyfriend break up and the NY Concert works as her last performance with the label.