Dream interpretation please?

Okay well I had this dream last night I remember it started out with me bein on a bus, this girl had gotten on and asked if anyone was sittin with me, replying no she sat down. I felt like I was the only one that could see her, except for an african American man that was glaring at her. I got off the bus and went and seen my mom I saw a picture of the same girl and asked who she was, she said it was a friend of her that was murdered wen they were younger, I got the name todd. Well we had went to my deceased grandmothers house and she came walkin up sayin she was going to church, I screamed knowing she was dead, my mother couldn't see het. I went to my dads moms, whose still alive, my great grandma & my dads mom walked up & I freaked out, my great g-ma is dead and my dads mom was dead in my dream so my mom saw neither. They said they were going to church. Well my mom and I were sittin on a bench I look back and my granmother that I saw the first time was staring back at me from the window reflection, she looked mean. In my dream I had this feeling that the man on the bus killed the todd girl. Can someone help me with the meaning of this dream.