Dakota Fanning's Emma Collins is a defining character in The Equalizer 3 and in the franchise as a whole, leading to speculation about whether she appeared in the first two movies as well. Dakota Fanning's role was highly anticipated by The Equalizer viewers, and it ended up being a bigger part of the overall storyline than expected. It also served as a reunion between Dakota Fanning and Denzel Washington, who starred in Man on Fire together. This contributed to their on-screen chemistry and made their The Equalizer scenes seem that much more realistic.

https://screenrant.com/was-dakota-fanning-emma-collins-in-equalizer-1-2/