Since I am the only one who mentioned Covid, I assume Grammeretto, that you were referring to my post.
I did not blame Covid for them not seeing her. I said Covid has changed the way things work in the world. It is unreasonable to expect to be involved in a medical procedure and it is not unreasonable to keep the baby safe both during pregnancy and when the baby is a newborn, ESPECIALLY since both unborn and newborns could be greatly affected by the Delta variant. If that means they are isolating family, that is what it means. We all had bubbles during the first wave, maybe her family is her bubble? We don't know because she is not here to tell her side of the story.
I never suggested that she should not expect to meet and spend time with the baby. I said large family gatherings were unwise right now with a newborn. She is due at Christmas, so any type of Christmas celebration may be taxing for a heavily pregnant woman with or without Covid.
While Covid is not to blame for everything, it HAS changed everything about how we live and it is short sighted to think that societies can go back to pre-Covid. That ship has sailed.
IMO, the OP is thinking about herself not the welfare of her grandchild when it comes to being at the birth and the health of a newborn. Even vaccinated people can carry Covid and that could be deadly to a baby.
She needs to figure out why her son has pulled away. To do that, she needs to ask HIM and not expect her DIL to facilitate a relationship.
It could be the DIL (a popular theory but not as common as we think). It could be the son. It could be the fact that the OP seems very demanding. Or it could be that there are mismatched expectations on all sides that need to be worked through by having conversations, accepting boundaries being set and learning how this new family dynamic is going to work for the future.