Dream of the death of an already dead grandmother?

[MysteryGirl05]

I had a really strange dream last night that I'm surprised has actually stayed fresh in my mind. In this dream I was laying in bed at my Grandma Polly's house (we'll call her Grandma 1) and someone called and told me Grandma Ruby (Grandma #2) had died. This is very odd as she actually died in 1997. So then I dreamed I got up and dressed for the funeral, then I had this great urge to go see her grave before the funeral (she was to be put in the mosuleaum so that's where her casket was, awaiting the funeral) I believe we were suppose to go to a chruch first because Grandma #1 told me not to be late. So I walked to this business like looking place. I said hello to this woman who was about to get on the elevator and when I turned to look at the doors that would lead me to the mosuleaum I saw two dogs sitting there. They were talking and I could understand them but I don't remember what they were saying. I knew immedietly they were dead (though they looked healthy) and that one of them was the woman's that had gotten on the elevator's dog. I turn to tell her but she is already gone. So I continue down this garden-like path to the mosuleaum (nothing like where she was actually layed to rest) and when I reach the mosuleaum I open the door and see my Mother. My Mother died when I was five so I look up and I go "Mommy!" She replies with a "Shut up Tanya." and walks into an elevador that was in the mosuleaum. Then I look around and see Grandma #1, my Aunt, and two other people I can't recall. My dead Grandmother was not there, but I had an odd feeling all these people were ghosts. Then I felt as if I had been there before, talking to the dead like that. I don't remember anything after that. It was a really odd dream. I think it may of been because I was trying a new method of astral projection because I've been attempting many times lately and the old way wasn't working for me. I still didn't manage it but I think that way helps me remember my dreams better, at least it did this one. So can anyone interpret this for me?