There is a sizeable contingent on Mumsnet that feels anyone who has a baby without owning a house in a desirable area, having a degree from a Russell group uni, 6 figure income and an expensive ring on your finger are basically feckless scroungers with feral children.
The reality is the most people are neither scroungers or Mumsnet wealthy on a 6 figure salary, and have perfectly happy children and home lives. Not everyone enjoys partying and constant travelling and don't feel they have missed out if they don't get to do this before having a family. I did some of those things before having my first at 26 and feel like I only did because it was expected. I have generally been much happier as a mum and now my children are much older doing chilled stuff, UK hols etc with DP and close friends.
You sound like a lovely mum and your DD and her DP sound like they are figuring out how to create a home etc for their baby, it's an exciting time for you all, enjoy it.
And as for the suggestions that mum should butt out, most of my friends have mums who are interested in these things for their children regardless of age, 20s, 30s, 40s when they have a baby etc.
I would certainly want to be a helpful nanna however old my children are, surely that's just part and parcel of being a family.