huntzall, Good for you!! You might do well to consider getting her a Remington 1100 or 11-87, both fine choices. Very dependable, practically bullet proof, light kicking, and reasonably priced. I shot thousands of rounds at game and even more at clay with these. Can't ever remember a malfunction from a 1100. They're just nice guns!
Don't get one with a fixed choke at full. I suggest you get her one with some sort of rem-choke system "or", if without that, one set at "modified" choke, a happy medium, that will still allow a good distance capability but a slightly larger pattern.
12 guage or 20, Start her out with good ear protection, some type shoulder padding, and the lightest loads you can get!! Don't take the fun out of it for her before she hardly gets started. Good luck!!
Joey