What you describe is a transfer of ownership. Even if the divorce decree defined how the parties divide assets, she still needs to go through the legal process of changing the name on the deed. Until that's done, DVC and the county where the resort is located will still recognize the husband as the legal owner.
Like Bill said, DVC can guide her through the entire process. It will cost several hundred dollars--should be under $500. The ex will have to sign paperwork agreeing to the change of ownership.
The transfer can be completed cheaper with a quitclaim deed but your friend will either have to secure an attorney to assist or navigate those waters herself. DVC also has right of first refusal on all transfers of ownership. Even going the quitclaim route, she will have to get a waiver of ROFR from DVC before the transfer can be initiated. Again, more things to handle herself.