Deep – Dreaming of a dead grandmother is important – See
https://dreamhawk.com/dream-dictionary/grandmother-grandma-gran/But in the back of your mind you knew she was dead; such knowing is often coloured by the belief that once your body dies that is the end if your existence. So with such beliefs your search was fruitless because you felt she did not exist, and in the world of dreams such feelings create what you experience in dreams.
Whether what we experience is beautiful or terrible, dreams are the amazing and tremendous experiences of virtual reality? Your dream, any dream, is a full surround experience of virtual reality. While in the dream it usually seems totally real to us.
You went to the police, suggesting that you reached out to solve or help with a problem, to right a wrong, for protection or support. So ask yourself what were you in search of and why?
In the end you light a candle which might be a way of remembering your grandmother or honouring her memory. It seems you do not know the ways your inner kife and dreams work, so ti might be helpful to read
https://dreamhawk.com/dream-dictionary/grandmother-grandma-gran/#Gran and
https://dreamhawk.com/dream-encyclopedia/dreaming-of-death/#WhoSaid - or. "Who said death was the fiinal end?"
Tony