Noora is being set up as a foil to Sana. In many ways, they are the same: they’re both smart, pretty, and opinionated, and neither of them drink or do drugs. The difference lies in how other people perceive them.
Noora is white with blue eyes and blonde hair. She is a perfect representation of what most people would consider a Norwegian person to look like. Sana, however, has always been perceived as an outsider due to race and religion. Sana has had to face many struggles that Noora will never understand, because Noora has the privilege of being accepted and embraced without question due to the way she looks.
I think the reason that we are seeing Sana reacting to Noora the way she is (not opening up to her about what she’s been feeling), and the fact that many of us are questioning Noora’s allegiances, is related to Sana feeling jealous of Noora. She’s feeling the unfairness of the fact that Noora is virtually universally loved and accepted, while Sana is ostracized. Remember those awful girls in the bathroom, and how they fawned over Noora right after disparaging Sana? It must feel so unfair to her given how superficial a lot of the differences between her and Noora are. Also Sana is still clearly upset over the Yousef thing. Noora seems to have no idea what she did, but Sana is still stinging. Still wondering, “why is it that everyone wants her and not me? Why can’t it be about ME for once?”
…Some rambling bathtub thoughts.