For married vs maiden name, it really makes no difference and would be nuts to change the deed just for that.
DVC MIGHT even change it over in their system without a deed change. An associate gets no benefits and a fiance or non spouse would not be entitled to the AP discount same address or different. But for a relative that would otherwise qualify, all you have to do is present proof of same address for an adult. That could be a drivers license, utility bill, voters registration, or similar.