El Mariachi: Give me the strength to be what I was, and forgive me for what I am.
El Mariachi: Carolina, did I thank you?
Carolina: No.
El Mariachi: I will.
Bartender: Bad beer, bad service. Don't people know not to come in here?
Buscemi: Just try and keep it from turning into a fucking bloodbath, all right? Not like last time.
El Mariachi: That one wasn't my fault.
Buscemi: Well, of course not.
El Mariachi: No, they started it.
El Mariachi: Bless me, Father, for I have just killed quite a few men.
Buscemi: No shit!
El Mariachi: It's strange how pulling a trigger is easier than playing the guitar. It's easier to destroy, than to create.
El Mariachi: Bless me, Father, for I have just killed quite a few men.
Answer: Having a tough-looking, silent henchman/henchwoman is a pretty common trope in action movies. She's basically there to look tough and mysterious. I wouldn't read into it more than that, especially given how minor the character is. (Minor enough that I had to Google her, because I couldn't even remember her, and I've easily seen this movie a dozen times over the years).
TedStixon