My wife has a Tristar Viper 20ga youth model semi-auto, and she really likes it.
13" length of pull, 24" barrel with choke tubes, and walnut stock. Around $500 bucks.
It's lightweight, but not much recoil. She also has a Yildiz 20ga youth model O/U, but it doesn't fit her very well, she has to really lower her head down to the stock quite a bit. I guess the Tristar has more drop, because it fits her better. She's 5' 6". (The Yildiz kicks like a mule. Doesn't bother her, actually, but you couldn't pay me to shoot it)
She hasn't had a chance to hunt phez with the Tristar yet, but she did shoot a bunch of ducks last January with it, using Fiocchi 3" steel #4's.