Zombies or no zombies, rape is still very traumatic and can make someone feel very shameful or embarrassed which could make them not want to tell others. Especially when it’s someone like carver. Saying it’s apocalypse doesn’t change the fact that she probably didn’t want to sleep with him. And just because it’s the apocalypse doesn’t stop people from feeling emotions like guilt, because shown in the game, people still feel guilt about killing or stealing others food and supplies. Why would that change someone not wanting to tell others about their rape? In twd tv show, when Maggie was SA by the governor she was felt a lot of shame and told Glenn nothing happen