Answer
Rose Namajunas has 4 submission wins in her MMA career. She won her first two fights by submission, first against Kathina Catron via an armbar in 2013, and then against Emily Kagan via an arm triangle choke in 2014. She has also won two submission victories in the UFC, first against Michelle Waterson via an armbar in 2016, and then against Joanna Jedrzejczyk via a rear-naked choke in 2018.