A secret to hide

Why

The whole walk home, Pinkie was thinking "Why would Dash skip the meeting? Did I do something wrong? Was I bad? I don't deserve this.". She was devastated. As soon as she got home, she avoided her sisters and rushed to her room. They sensed something was wrong so they followed after her. The first thing to be heard was to napkin wetting sobs of their baby sister. Sisterly instincts pushed them to come in and ask what was wrong. "Pinkie, why are you crying?" Maud,the oldest, asked. Pinkie didn't respond,but did get slightly quieter. "Please tell us. We don't like hearing you cry." Limestone said, which was really out of character for her. Pinkie sniffled and said "I just don't get it guys, Why would she abandon us. Maybe I did something wrong ? Maybe it was cause she lost the game. Wait..." Pinkie stopped, then sat up. She looked at her sisters, eyes still puffy and red, and said "She froze after I told her that she could do it. Maybe I triggered something and that's why she lost. Oh, its all my fault. I'm never going to school again. She'd hate to see me.". Her sisters were super confused, but Limestone knew one thing "Look Pinkie we know you're upset, not sure why, but you have to go back to school no matter what, not just to resolve this problem but also because mom and dad would never let you stay home forever.". The other two nodded. Pinkie looked at her sister and smiled a little. "You guys are right. Thanks" She said, then lied down. Her sisters walked out and Limestone remarked "Thats the first time she didn't hug us when we helped her. Also who is this girl she was talking about?" They all shrugged and continued downstairs. Pinkie overheard and said "I don't think they can know."