Sure, it helps that your character Maria-Elena was written rather brilliantly and seemed already fully sketched well before you appeared on screen. Indeed, the first part of the movie is spent waiting for you to appear, from the moment we learn from the other characters about how the tempestuous and mercurial Maria-Elena stabbed her ex husband and later tried to kill herself. Most actors would have a hard time stepping into such an overdetermined narrative, but not you. You filled it up. Made it a little funny, even.
p.s. congratulations on your oscar.
p.p.s. you make me want to start drinking diet coke again.