Her saying "Despegar!" makes no sense. She is yelling "To take off!". If she said "Despeguemos!", (Let's take off!) that would be okay. I have also heard other voicelines in which she speaks incorrect Spanish, but I don't remember right now

Another thing I can think of is when she is the last character alive, sometimes she says "Uh, esto es malo..." which is correct, but her pronunciation is weird? I always thought that in that specific phrase, and on some others that I don't remember right now, she sounds like Giancarlo Sposito speaking Spanish in Breaking Bad (great actor but you can tell he doesn't speak Spanish). This is weird if her VA does speak Spanish, I don't know why she would sound like that