Firing into the air seems pretty dumb, though. For one thing it allows the continual waste of oxygen by the criminal.
She should have shot the dude dead. No question.
Firing into the air could have gotten her boyfriend killed, and the bullets have to come down somewhere, and at nearly the same speed as they went up.
Got that? Be a good witness. Surrender your money, your possessions, maybe even your life, but don't you dare fight back or walk around armed.
After the crook leaves you with whatever he decides is not worth taking, call the police. I'm sure that within an hour or so, someone will be down to take a statement, which will be filed away and probably never be seen by human eyes again.