Dakota Fanning's role as Emma Collins in The Equalizer 3 was highly anticipated, but her character's identity and history with Robert McCall proved to be much bigger than expected. Nearly two decades after Fanning and Denzel Washington starred in Man on Fire together, the actors reunited in The Equalizer 3. Fanning joined the franchise as Emma Collins, a DIA officer who becomes an unexpected ally to McCall as he fights the Italian mafia. This gave the duo plenty of time to work together again and share scenes, but The Equalizer 3 made Fanning's character more important by the end.

https://screenrant.com/equalizer-3-dakota-fanning-collins-plummer-daughter/