Congrats on taking out your daughter - she's a lucky girl!
There is almost zero women's waterfowl clothing, so we usually have to settle for the smallest men's or the largest boys' clothes. One exception: Cabela's has one women's waterfowl jacket, and one or two sets of women's waders. Many men's jackets don't come in smalls, but Drake does. I haven't tried them yet, but I'm about to - just ordered one of their jackets today.
One of the most important things to do with the gun - if you haven't done this already - is to check for her dominant eye. I've heard about 80 percent of women are cross dominant, which means if we're right-handed normally, we'll actually shoot better left handed. (Then of course it helps to have a stock cast for leftie shooting.)
If you can spring for a gun-fitting by a great gunsmith or stock man, go for it - that helps a lot.
Couple other things you need to know as a dad taking out a girl:
* Our fingers and toes get really cold really easily. When the rest of me is warm, my fingertips are ice cubes. You might want to get some little chemical heat packs for her feet and hands.
* It's a lot more hassle for us to take a leak than it is for you, and we tend to be more modest about it. Not sure how you wanna handle that, but if you're hunting at a refuge loaded with people, you should warn her that she probably won't be able to hide when she drops her waders.
Those are the big items I can think of. From what I've heard about dads hunting with daughters, you have a lot of great times in front of you. I hear over and over again that we're more observant and less competitive, and guys tell me that comes to them as a pleasant surprise.
Have a great time!
Editor, California Waterfowl Magazine