>>25207784Every time someone or something threstens her way if life, one of her sisters gets taken away. First Pinkie left after a seeing a rainbow and throwing a party. Then some college guy convinced Maud to study for her rockterate, so she left as well. Since then, Limestone has been the dominant one to make Marble too shy to accept anything out of the ordinary so she won't leave as well. She's abrasive to hide her sensitive core because deep down she's terrified of being left alone. She's mean to guests so they'll leave beforevthey can convince anypony else to leave home.
