My nan passed away and I feel so traumatised

My nan passed away a few days ago. She was getting sleepier and sleepier as the days went on. Me and my family managed to get to her in the nursing home about an hour before she passed. She was complaining she couldn’t breathe and calling out for help and saying that she didn’t have long and to please kill her. We all felt so helpless. It felt like forever that anyone would help her. She was having to readjust and sit upright but it wasn’t helping. I could tell how much she was struggling to breathe. Eventually she was given some sedative but I don’t think it was given in time and she did pass. I can’t stop thinking about that as my final memory of her and how much she struggled in her last moments. Please bring me some peace in this matter. I know she wasn’t in pain but it was the fact that she seemed to struggle