Lethbridge has been in her current role since joining the Commercial Bank in July 2017. For the first nine months of 2024, the Commercial Bank of Qatar reported a net profit of $643.2 million and had $44.8 billion in assets. In October 2024, the bank signed a MoU with DHL Express Qatar to launch DHL4SMEs, a resource for SMEs needing guidance across multiple aspects of their operations. In September 2024, the bank issued its inaugural three-year Green Bond for $266.8 million. Lethbridge serves as a board member of Alternatif Bank and previously spent 15 years at ANZ, including as CEO of ANZ Royal Bank.