This trial is testing a drug called sacituzumab govitecan-hziy, which targets and kills cancer cells. It focuses on patients with advanced triple-negative breast cancer who have limited treatment options. The drug works by attaching to cancer cells and releasing a substance that kills them. Sacituzumab govitecan-hziy is an FDA-approved treatment for metastatic triple-negative breast cancer, especially for patients who have already tried other treatments.