Death of a loved one already deceased!

My grandmother, my mom, my aunt, my uncle and some other people were in the hospital. The doctors were feeding my grandmother some kind of liquids to make her die faster, and she had IVs in her. I remember walking around with her (By walking I mean Her arm around my shoulders and my arm around her waist kinda like carrying I guess) and she was slurring her words due to the liquid she was drinking. We started walking(my grandmother and I) because the liquid wasnt working fast enough, then we wind up in a black car, maybe a hearse or limo, and the driver was drinking. I remember him from earlier in the hospital, somehow he knows my Aunt. He gets in the vehicle and starts driving fast, the police are behind us wanting him to pull over, but he doesnt. I cuss him out, tell him i will have his job adn that he is ruined. He kept saying that we had to pick up the marines. We make it back to the hospital and my grandmother and I are walking into a church pew it looks like. I cant tell if it is a tv or a preacher talking, but our family is around along with some other people I dont know. Up till this point she still is alive and somehow I have a guitar. I sit down with my grandmother on the bench and just like that she dies as soon as we sit. I felt her hand and she was gone. I talked out loud, shes gone, and just like that I busted out in hystrical tears…. I woke up after this dream and felt scared and weird. I started crying and called my mom and told her about it. Its almost been 4 months since she passed and this is the first time Ive dreamed of her. I last thought about her around New Years adn a few weeks after that on her birthday.