The women's 4 × 400 metres relay at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha, Qatar, from 5 to 6 October 2019.

She was so far ahead at the break, there was no need for strategic maneuvering, and she ran a perfect tangent from lane 7 to the beginning of the far turn taking a 5-metre lead on Patrycja Wyciszkiewicz with Britain's Jodie Williams close behind.

It was almost 20 metres over Poland's Małgorzata Hołub-Kowalik by the handoff, which behind her, Jamaica's Stephenie Ann McPherson was able to pull back lost ground against Britain's fresh Emily Diamond.

With Jonathas long gone over 20 metres ahead, Święty-Ersetic stayed on Jackson's shoulder through the final turn then pulled into lane 2 for running room.

Unable to respond, Jackson gave up the fight and eased across the finish line with bronze 3 metres behind.