I don't think many of you are thinking through all the safety considerations. Lime creek is a narrow, rocky, chasm; and requires skill, and considerable strength. Especially at the neck.
I recommend that you get Meagan a sturdy helmet, such as the one shown here:
The great thing about this helmet is that you can secure simple bar weights from your home bench and add 5lbs, 10lb, even up to 30lbs of weight to strengthen the neck muscles that are required for negotiating Class V rapids. Just think of the swelling pride you'll feel when she styles the Dragon's Back with 20+ pounds of iron on her helmet, and the "trapazoid triangle" of a pro wrestler.
Good luck, Meagan!