C42 Man is not a ghost

The next morning, when I woke up, I didn't see any foam. Zhou Ling and the child were still there, but only the foam had disappeared. She shouldn't have been taken away by anyone else, but why did she have to leave?

I called out to her twice, but she was nowhere to be seen in the bathroom or the room next door, so I didn't know where a child like her would go. I wanted to look for foam