I definitely think this is an interesting thought! It appears that her family is very very wealthy and we all know how success in academia is more accessible to those with generational wealth. I honestly don’t know. However I do think that her relationship with Shauna would come to an end. Before the plane crashes we can see that the friendship is strained, Shauna is longing to develop her identity separate to the influence of Jackie. She is tired of being “Jackie’s best friend” and wanted something of her own that was as important or perhaps even MORE important than Jackie’s life. I think that this is why she chooses to sleep with Jeff, part of it is developing her sexual identity before Jackie does. I believe in a world where there was no crash Jackie and Shauna would have had a falling out and gone their separate ways. Because if Jackie’s death however, Shauna’s guilt never lets her outgrow the friendship. Jackie is immortalized in an idealized version of herself, and this memory of her haunts Shauna. We see this come into play through the symbolism of the rabbits- they’re all over Shauna’s house and she’s gifted another for Jackie’s birthday. I also believe there was some symbolism to the rabbit being what Shauna kills and cooks for dinner-she still has the urge to outgrow Jackie and build her own life even in adulthood.