Mary says she saw a ghost last night, but her friends think she´s crazy?

Mary says she saw a ghost last night, but her friends think she´s crazy. This is what she says. I have never seen anything like that! I'm not crazy! I had heard stories like that before, but i never thought is would happen to me. I seen a ghost before that , and nobody believes me! I saw the ghost tomorrow, but i never thought they really existed! Cual es la correcta.