On August 4, 1836, Mary Adams married Samuel Augustus Maverick, a Yale graduate who had been the Alamo garrison's delegate to the Convention of 1836 declaring Texas' independence from Mexico. Sam Maverick sold his Alabama plantation at the beginning of 1837, and Mary Maverick accompanied her husband to New Orleans so that he could conduct business and be closer to news of Texas. While she was in New Orleans, her brother William Adams left for Texas. In March 1837, she and her husband visited his father in South Carolina, where they refused the elder Maverick's gift of his plantation. On May 14, 1837, she gave birth to her first child, Samuel Maverick, Jr. in South Carolina.