Grandmother is dying?

My grandmother is currently dying and I don't know what to do. She is far away and she suffers from dementia. I was given the news and I had only minutes to decide wether or not I wanted to go see her. I love my grandmother very much but I all of the rush I decided to say home while my parents when to visit her. Now I regret making this decision. I feel horrible for now visiting her in the hospital. I fell as if I skipped out on her in her time of need and I also feel like a coward. I think I chose to say home because I couldn't stand to see her in the state that she is currently in and I was also afraid. I also didn't think wether or not I visited her would make a difference to her because of how severe her dementia was. I know that when my mom comes home she will probably be an emotional wreck. So I am trying to figure out what I can do to comfort my mother and what I can do to help me live with the decision to not see her in the hospital and move on with my life. I cared a lot about her but I know that I can't let her death destroy my life and I know that she wouldn't want that to happen to me. Can anyone give me advice on how I can deal with this?