I did some research when I first learned about this case and saw that the prevailing theory was suicide. I simply could not wrap my head around the idea that two sisters would commit suicide together, but many of you posted about other twins who have done this. On my quest to learn more, I came across more than a few sad stories on Reddit that were written by individuals struggling to create a separate life from their twin in adulthood. They were heartbreaking stories to read, TBH.
Although the Husztis are triplets, the third sister was obviously able to successfully forge her own identity early on in life. I found a few studies about twins with codependency or boundary issues, but I really think there needs to be more research (or maybe, more importantly, awareness!) focused on this complex and complicated issue.