I don't see how it is weird to want to see a grandchild when you are all excited. You make it sound like a possession, Sock
the bottom line is if your not the mum or dad then it is not your baby. It's equally as lovely to see a baby that's 2/3 days old or even a week old as it is to see one that's a few hours old.
I would say it was much nicer because after a few days when you have been invited your clearly wanted and not making anybody uncomfortable either emotionally or physically.
If the new mum is happy and quite comfortable after a few hours then great but if she's not then getting all upset or feeling pushed out and being dramatic for the sake of a couple of days is most certainly wankerish weird behaviour.
And I quite deliberately say new mum and not new parents because the mum is the one whose comfort levels need to be accommodated after all she's the only one who has physically given birth.
What difference do a small amount of days actually matter to anybody when it comes to welcoming a new baby, it does not matter to the baby it's not as if they care about socialising,your not going to miss anything at least not anything that you have the right to witness.
There comes a time in everybody's life when they are done with having their own children often their children have children of their own,no matter how much you love them or want to recapture those precious moments makes no difference. They are no longer your moments.those moments belong to the parents,often the most considerate thing is standing back and smiling to yourself because you know that your child is having the same experience you had.
That's the main job when being a parent getting them to a point where you can stand back.
She's not asking for weeks she's asking for a few days,if those few days are important for her comfort your excitement does not matter.