In February, she was discovered "unconscious and unresponsive" in her Manhattan apartment. Although officials did not conduct a post-mortem examination, toxicology tests indicated her cause of death. Family members, adhering to their Orthodox Jewish beliefs, had declined an autopsy, which the medical examiner respected due to a lack of foul play.

A source disclosed that Trachtenberg had undergone a liver transplant prior to her passing, although details regarding the procedure remain unclear. The news of her death has greatly impacted her fans and the entertainment community.

As a child star, she first made her mark in Nickelodeon's productions, eventually earning accolades, including a Daytime Emmy nomination for her performance as Dawn Summers in "Buffy the Vampire Slayer." She later gained fame for her portrayal of Georgina Sparks in "Gossip Girl" and appeared in various films such as "EuroTrip" and "Ice Princess."

Following her untimely death, tributes poured in from colleagues, including Blake Lively, who emphasized Trachtenberg's incredible dedication and spirit, recalling the joy and love she consistently shared.