It's the same as the Disney weddings and you can do as little of a vow renewal as you would like or a full on package, basically a second wedding. Tell her to visit www.disneyweddings.com
and check out the memories or escape packages, which are primarily used for vow renewals. Usually the venues are like the Poly beach, the Boardwalk gazebo, and the Wedding pavilion is also an option also. The website has a lot of great info and pricing, and shows other locations like the Disney cruise line weddings. Email me if she has specific questions and I can try to help, I love talking about Disney weddings and did a lot of research while planning mine!