BTW usmom, while I mentioned that my friend had a Baretta 20, I failed to mention that it was an auto loader. Double barrels are fine and all, but considering that you describe yourself as "petite", go with the auto. over/unders typically have heavier barrels which requires a longer reach and upper body strength to hold on target, especially repeatedly on the range where you'll tire quicker. With the auto, the center of gravity is moved rearward towards your upper body, and helps mitigate that problem.
On more thing regarding the Baretta, it's a beautiful weapon, but like most things from Italy or Germany, it's over engineered. My friend loved shooting it but hated cleaning it. Complicated, intricate design.
My Browning "Golden Clay's" auto on the other hand is; beautiful in its simplicity, and that design makes it easy to clean too.
Can't go wrong with a Browning (IMHO)