I ended up buying her a 20ga H&R compact Pardner pump. At the store she seemed to have no problem with holding the gun or working the action.
I know these are made in China but for the price ($159) I don't think you can bet them.
My only complaint so far is the action isn't as smooth as my 870.
I wish I could have afforded to get her an 870 because mine has never let me down!