some will say that the 20 is on the light side for waterfowl, some of thoseare also the same people that have to have 3.5 10-12ga guns for ducks and turkeys, people have been killing game for years with 2 3/4" 12's w/ 6 shotfor years, the only thing i would suggest, as i have not hunted ducks or geese in several years is the fact of the shot regulatons changing, shooting steel, or bismuth or whatever, it may be required to have the higher shot capacity, you may want to check on the waterfowl board, last time i went we was still slinging lead, BTW as mentioned the 870 youth or the mossberg 20 youth are great guns...let us know what she ends up with