dream of dead grandmother coming back to life

[pandora]

Hi, some history first:
my grandma died about 9 years ago and I found out by walking in and seeing her dead body in her room at the hospital not knowing she was already dead. We were alone in the room and I was mystified at first why her body was still there and all my relatives were gone.
My dreams about her began soon after she died. They usually involved her falling by the staircase on our second floor and as she fell I would try to catch her but she would shrivel up and turn black and blue.
As the years went on in my dreams she was still alive somehow she had died for a period of time and magically came back to life and was healthy.
Last night I had a dream about her again. I walked upstairs and she was exercising by the staircase. She asked me to watch her in case she fell and I was thinking to myself how much healthier she got since she had her heartattack 10 years ago (in my dream she was 92 - but she actually died at 92 and not of a heart attack).
Then in my dream I remembered that she had actually died so i ran downstairs and called my mother and asked her if it was true if she did actually die, and she told me that she died but the doctors were able to revive her immediately afterward. So comforted I went back upstairs to watch my healthy looking grandma exercise, then I remembered that I walked in on her and she was dead and I stayed with her dead body for almost 15 minutes so it would've been impossible that she had been revived. Again I ran downstairs and asked my mom if this was true, and she said yes but somehow she came back to life, but not to say anything about that to my grandmother so she doesn't get freaked out. So I run back upstairs to watch my grandma again and then i remember that I have already visited her grave, and that's when I wake up from the dream.
Why do I keep dreaming of my grandmother coming back to life? Anyone know how to interpret this one? Thanks