Lily, Rufus, and the rest of the family gather at the hospital. Despite Serena's insistence that she was framed, the doctors and Lily are convinced she needs help, leading Lily to have her committed to an involuntary rehab facility.
Dan Humphrey is the only person who truly believes Serena was drugged. Meanwhile, Vanessa attempts to shift all the blame onto Jenny to protect her own standing with the family. [S4E10] Gaslit
It is revealed that Juliet, Vanessa, and Jenny Humphrey collaborated to destroy Serena's reputation. Their plan included getting her kicked out of Columbia University and making her family believe she had relapsed into drug abuse. Lily, Rufus, and the rest of the family