God I find the dynamic between Shauna and Jackie just absolutely fascinating and complex. There really is just something about female friendships, especially around teenage years, that makes for such great stories. Does she want to be her? Does she like her? Does she love her? Does she want to consume her? The fact that ultimately at the end, Shauna is literally living the life Jackie-peaking-in-highschool-becoming-an-housewife would have had, and this out of (seemingly) pure guilt (and probably due to various other identity issues emerging from Jackie not being there to tell her what or how to be)... Like there are layers to this shit!!
Speaking of Jackie, I don't really buy into the whole "Jackie is self-absorbed" narrative that they tended to push. Well, I mean, she is to a degree, but not any more than any other teenage girls (both in general, and within the group here). There are lots of instances where we see Jackie acting out of selflessness, mostly regarding Shauna, but there are moments with the other girls too.
Her death feels so impactful, storytelling-wise, because throughout the entire run of the show, they made quite a big deal to depict Jackie as the pillar of society and highschool norms. She's the pretty and popular influential American girl. Throughout the episodes, she's the only one that seems to ground the group into stereotypical highschool tropes such as playground gossips, "parties" and "(homecoming) dances" and boys drama, but she's also shown to be the one who doesn't learn (nor wants to) how to live in the wilderness even after it's been months. So it does feel like she (at least her death) works as the catalyst for the group sinking into madness and cannibalism. Those societal norms are well gone. Because although Jackie had very little influence left (a great contrast to episode 1), there are lots of subtext about how obviously she once was an influential leader of sort (and how that is sort of held against her too, which I find fascinating). And with Taissa herself obviously losing some of the group's respect after her failed excursion deeper into the wilds, it just makes perfect sense for Lottie to rise to the tops of the ranks as the most influential person in the group. It's a very small thing, but when Shauna and Jackie were fighting, and Coach Ben tried to intervene, Lottie immediately shut him off - which is obviously a pretty big red flag as to how the power dynamics will change very soon. Speaking of the coach... In light of what I just said, I reckon he's next?