http://www.mit.edu/~jfc/right.html -- Keep Right Laws
Most states require drivers to keep right if they are going slower than the normal speed of traffic. In Florida, it looks as though this is also the case, but the left lane is not reserved for passing. Unless the female driver was going under the speed limit or slower than the speed of traffic (there didn't look to be much traffic), it seems as though she was legally in the clear on that point.
To the commenter who said that the female driver should have stopped to see if the guy was okay, that's probably not a safe thing for her to do, considering the circumstances. The male driver was probably really angry and aggressive once he crashed his truck. She could pull over and call police though.
I'm surprised at how many people in Colorado (where I live) think that the left lanes are always the fast/passing lane, regardless of the type of road or speed limit. Common sense dictates that when driving around a city, people are going to have to turn left into lots and businesses (just as much as they turn right) and therefore would need to be driving in the left lane in order to do so. It's things like this that make me wish there were mandatory tests for driver license renewals. Don't even get me started on people's confusion with 4-way stops or u-turns.
I also see people whipping over 4 lanes of traffic at the last possible second --cutting everyone else off-- to make their turns. Please don't endanger the lives of others because you are about to miss your turn. There are other turns, I promise.