My 11-year-old daughter had suddenly started washing her underwear separately from the rest of her clothes, and whenever I offered to help, she would snatch them from my hands. At first, I thought she was becoming shy because she was growing up. But then I noticed she had started pouring water into the bathtub after every shower, and the water would sometimes turn reddish. Whenever I asked what she was doing, she would quickly say, “Nothing, Mom.” I didn't want to make her uncomfortable, so I let it go. Until she started begging me not to send her to school. Every night, she would ask, “Mom, do I really have to go to school tomorrow?” At first, I thought she was just being lazy. Then she started complaining about stomach pain every morning. Sometimes, she would sit on the edge of her bed in her uniform and suddenly begin crying. Whenever I asked what was wrong, she would shake her head and say, “I just don't want to go.” I became worried that something was happening at school, but she refused to talk about it. One afternoon, while putting away her clothes, I discovered a small plastic bag hidden at the bottom of her wardrobe. Inside were several pairs of underwear with dark reddish-brown stains. I immediately called her into my bedroom. I held up the bag and asked gently,