C231 They've All Left Me

"Yesterday, when Yuyan went out, Dad wasn't home. Dad didn't even know that she went out. Dad didn't see her when he came back last night, so he asked you, Auntie Meier. Your Auntie Meier said that she went out. I thought she went out with her classmates. I didn't ask too much. I felt that it was very strange that she didn't come back for the whole night