... survived the destruction of Vulcan?
There are less than ten thousand Vulcans left... they are now an endangered species. Do you think T'Pol would be one of them? At the time of Vulcan's destruction, she'd still be a spry 170, plenty young enough to still be around. Maybe an appearance in Star Trek (X)II? (Probably too fanboyish for a movie, but it'd fit right in if nuTrek were a weekly series...)
She may have been killed. But her adult niece/daughter who looks just like her may still be alive and catsuiting around in her stead.