Because Terminator: Dark Fate is partially set in Mexico City, which is where Dani and her family live, much of this trailer is filled with Spanish, with makes sense. As for Dani herself, she’s living a normal life with her father and brother, filled with work, friends and other joys. Sadly, that all changes when the Rev-9 shows up looking like her father. I fear Papa Ramos is with us no more.
Article source: https://www.cinemablend.com/news/2481408/spanish-terminator-dark-fate-video-focuses-on-newcomer-danis-experience