Answer
In the iconic film "Trainspotting," Shirley's character is named Gail. She portrays the pivotal role of Mark Renton's girlfriend, navigating his tumultuous journey through addiction and self-discovery. Her character serves as a mirror to Renton's struggles, representing both the allure and consequences of drug use. Gail's arc provides a compelling emotional thread throughout the narrative, highlighting the complexities of addiction and its impact on personal relationships.