My Wife is a leftie & has never been plauged by brass pelting her... Dunno why semi's don't like you...
We come in a variety of sizes and shapes, just like the men do. And just like one man's comfort with a particular type of gun doesn't mean every man will be comfortable with the same type, it holds true for women as well.
The adrenaline is a bit of a double-edged sword. I truly do believe that if I had to use my firearm and a shell went down my shirt, my first thought would be that I was hit. This would probably cause me to do one of two things:
1. Stop fighting all together from the fear. (Yes, that's a bad mentality, but a realistic one)
2. Full blown panic and take a shot when I shouldn't. (Putting innocent bystander in danger and wasting ammunition. P.S. Wasting ammunition should be a concern no matter how many rounds you've got.)
I'm not saying that women shouldn't carry semi-automatics, they should carry what they're comfortable with.