I too am left handed and I have Beretta O/Us and 3 Remington 870s. The 870s are right handed and I never had any trouble shooting them. Occasionally in a duck blind I had powder blow back in my face when the wind was just right but that's about all. And for trap (doubles excluded) I don't see a problem getting her one in a youth model. The 870 has a reputation for being a smooth action reliable shotgun. The Browning BPS is also a very good gun for her.