Dream About A Missing Sister And A Dragon Head

I visited a male friend at his house and he had stated his sister had been missing for years. No one was able to find her body. I’m a curious person at heart, so I searched the house for clues about what happened to her. I searched her room, but it appeared to be an average girls room with decorations and makeup on her dresser and nightstand. The room was tidy, but mostly kept the way it was when she died. I visited the backyard and noticed something strange. The house was beside a rock formation with many boulders and smaller rocks. It appeared the girl hid something inside, and it was the decayed head of a dragon. She befriended a dragon, and it passed away, so she took its head and buried it under the boulders. I said not a word to the parents and brother because she must have done something bad to have vanished. The family had dinner and talked about the past and how the girl used to live her life, but it faded and I woke up.