Michelle Trachtenberg battled persistent health challenges in the years leading up to her sudden death last week, a friend disclosed. A close source told Us Weekly that Trachtenberg, 39, frequently dealt with medical issues, including chronic back pain, bone problems, and multiple falls. ‘Every time we spoke, she was struggling with something health-related,’ the insider shared. The Gossip Girl and Ice Princess actress was found unresponsive in her New York City apartment on Feb. 26, with sources reporting she had recently undergone a liver transplant. While the Mayo Clinic cites genetic disorders, cancer, hepatitis, or excessive alcohol consumption as potential causes of liver failure, her friend clarified that although she drank, she was not known for partying excessively. ‘She was never the type to go wild—she became more of a private person in recent years,’ the source added. Trachtenberg reportedly spoke openly with close friends about her transplant but avoided going into detail....