Firstly, I am so sorry you are losing your grandmother. It’s a very difficult time and my thoughts are with you and your family.
But also I agree. My family are Irish, me being the last one born there. My grandad died in similar circumstances to the one you are in now. In his room with family, it was just about spending time with him and accepting we were losing him. Outside the room, with my (now ex) husband people kept telling me to keep my chin up and he might recover. Or people blanked me just looking awkward.
My mum died suddenly last December. And loads of people I considered to be as close as family just never got in touch. Or did until they funeral and then disappeared. Apparently, me still grieving 6 weeks after she died was bringing them down. Or they were uncomfortable by our funeral traditions such as bringing mum home. Or the fact that we knew mums funeral wishes, despite her only being 66 and fine until the morning of her death.
I think people just don’t know what to say, because there’s nothing that can make it better and people just can’t deal with it.
In My family we talk about them and listen to eachother and just support by spending time together. We all know no one can make it better so don’t try. But it feels more natural.
I am often surprised how much people in England try and shield their children from any mention of death. Again, it’s not something my family do. We don’t shove death down their throats but don’t hide it either.
Just to say, these are my observations of differences between Irish culture and English culture. It’s obviously not everyone’s experience.