Is that a bike you'd ride from here to Arkansas on?
People take off on them and ride down into Mexico or up to Alaska all the time, so I don't see any real reason why you couldn't ride it up to Arkansas, especially if you are staying off the interstates. They will run 75-80mph on the highways, but it is not real fun to do it for any serious amount of time (several hours or more). You can run them at 65-70mph on back roads all day long. If desired, you can add a simple windscreen that mounts to the forks/handle bars just to make the highway speeds smoother.
If you were going to ride it all the way to Arkansas and back, I would definitely go for a more 50/50 big block adventure tire rather than a full on knobby (Dunlop 606, Pirellie MT 21, etc,...).
Here is the DR/DRZ thread in the Dualsport section of the forum.
http://www.twtex.com/forums/showthread.php?t=49092
LOADS of info there.
I mention the DRZ400 primarily because you said she wanted to use it for adventure riding, which means different things to different folks, but in general I take to mean a mix of pavement and dirt. The DRZ is great for that, inexpensive, cheap to maintain/repair, and readily found. It has plenty of power but is not intimidating. It can carry a good deal of luggage and depending on the gas tank will have decent range on a tank. And, as I mentioned before, you can sell it later if you think she needs something different and take little to no loss on it unless you tear it up.
There are some other newer bikes. Honda has the CB500X, which is probably a decent 50/50 bike. However, I'd throw some crash bars on it real fast before going down any dirt roads. I don't know if they are available with the DCT or not. If you buy one new and she decides this is not for her, you will take a serious hit on it when you try to sell it. The same will be true for the 700X. I would not make a big deal about the DCT. Learning to ride a bike with a clutch is not hard. Unless you are stuck in stop-n-go traffic for any length of time, there's not really any time it will be a real negative.
Another often overlooked aspect is the size of the front tires. Bikes like the DRZ usually have at least a 19" front and more often a 21" front. When riding on dirt/gravel roads, this usually improves handling versus a 17" front wheel. For instance, I never developed a trust in the V-Strom 650 I had when riding on unpaved surfaces because the front end simply never felt planted compared to other bikes I'd ridden with bigger front wheels. That said, there are a LOT of people that love their V-Stroms for dirt/gravel roads. This is where the type of tire can also make a BIG difference.
Unless it is just too tall, the first thing I would do before spending ANY money (except maybe on gear for her) is put her on that XT250 and let her putt around. That will tell you a LOT in a hurry.