I don't have any experience with that model, but my 9 year old son shoots the 20 gauge Mossberg Mini Bantam and my daughter shoots the 20 gauge youth 500 Bantam. Both of these guns are very light and designed for kids.

I have a 12 aut. it is a grate gun at a good price.

I bought my son his first gun; the Rossi with the 22 and the 20ga. He did great with it, but the 20ga is brutal on the shoulder. I would highly recommend getting a 20ga automatic. I bought him the Hansan auto from Academy ($300)the next season and he still shoots it 3 year later and its like a cap gun. That single shot crack barrel gun is adequate but your son may hate you for getting it and subsequently give up on hunting. If you can afford it; get and autoloader.

My son shot one since he was 8 years old and it kicked the snot out of him so much that when he graduated to the Youth Pump, it was a relief. He hated it. The pump guns are a little heavier and kick a lot less.

Keep in mind that the amount of kick is related to the shell you are shooting and its energy. The crack barrels will kick more than the slightly heavier pumps. The best option in my opinion is to get a semi auto, which will use the some of the energy to cycle the shell and deliver less of a kick. Also, shoot 2 3/4 shells, not 3 inch. Also, look for low brass steel at Academy or online. That way you can get her used to the idea and step up gradually. I think the best way to ensure that she hates duck hunting is to get a crack barrel and shoot high power duck loads through it. My opinion. Cheers for getting her involved.