Camshaft,
It's ok to be concerned with her safety. It's not ok to bully her into thinking as you do, or seeing things from your point of view. What you're doing with this is telling her, "I don't care what you think, I know more than you and you're doing it wrong if you're don't do it my way." Don't rationalize it, that's what she hears. Take it from me, I know puertorican women (assuming she is); I'm married to one, and I am also puertorican. I know how stubborn we can be. Nonetheless, it might just help you to place a little trust in her, and to concern yourself with your safety first. Assuming you're more detailed than she is, it would be best if you can think ahead and "predict" how she'll act and be prepared to deal with it rather than to critizice her...
Just my .02 psi.