Both are good guns. IMO, the decision should be made by how well each fits her. The kicker, for me, is the drop. The Rizzini likely won't have as much drop as the Beretta. Not a big difference, but enough for me to choose Beretta. I just can't find a Rizzini gun that doesn't shoot too high for me. Others don't necessarily have that problem.
If you can, have her mount each gun empty and aim at your master eye, after verifying that the gun is unloaded, of course. You can tell if she is looking down the rib as she should, or if her eye is too high in relation to the rib. Shooting a plate is the best test, however, if possible.
Fine guns for clays, both.
SRH