[2] On June 10, 2018, she gained widespread distinction after her come from behind victory in the 1600 meter relay at the NCAA Track and Field Championships.

She caught Purdue's Jaheya Mitchel at the finish line, giving University of Southern California the team event and its second women's track and field national title in program history.

She competed at the 2015 Pan American Junior Athletics Championships and won gold in the 4×400 m relay and bronze in the 400 meters.

[6][7] Ellis competed in the women's 400 metres and won gold in the 4x400 m relay (participating in the heats) at the 2019 World Athletics Championships.

Ellis was St. Thomas Aquinas High School (Florida) teammates / relay partner with IAAF World U 18 and U 20 medalist Khalifa St. Fort.