I'm more rattled by the fact she hasn't asked or even bothered with her grandfather!!!
I bet he sent lots of cards and gifts when your DD was younger, and when he was more able to!
I also bet there were lots of happy hours spent in each others company but now that he's old, and frail, she doesn't want to know?!
What will happen when the poor chap dies, will she scoot along rather quickly for the reading of his will?
It's good she can spend so much time with her child, but he'll be off to school in a couple of years, possibly nursery even sooner, whatever will she fill her time with then?
Why not at your house or her house? At this age the child should have plenty toys to keep them amused indoors for the odd days they can't or don't get out, what's so wrong with being indoors occasionally?
Is she embarrassed by your home, or by hers?
Could you invite both parents and GS to yours for a meal sometime?
Or get in touch with her husband yo ask if you could go to their home to see them all together, for a nice change, as it sounds like you don't get to see him, either?!
I'm still upset for her grandfather!!!