It's implying that she stereotypes him as an immigrant child who doesn't understand English and is, by extension, not very intelligent. In reality, most Latino children in USA speak English fluently and many don't speak Spanish at all, but many white people stereotype them as ignorant and monolingual Spanish speakers on the basis of their appearance.
It's one of the scenes that sets up her character as a ditzy and culturally insensitive person (the type of person the CEO wouldn't like).