By the time she was allowed to leave Antonin's house as a fresh recruit to the Death Eaters, she had been properly trained and conditioned to her new reality to not be bothered much by the horror and depravity she saw at the mass gatherings of the Dark Lord's followers. Her teacher kept her isolated from most of the worst acts. Though he had never shielded her from the violence, he hadn't allowed her to actually join in until he was satisfied that she was finished with her training. Or, rather, until he was satisfied that all of the parts of her mind and soul that made her into the bookish best friend of Harry Potter had been removed from her personality entirely. Once he knew that she was the exact puppet his master requested, he'd let her partake in the fun.