If she went to her kids, kids do, then Ron would have had a lovely play and mingle with some other little ones. So fun for your son, and being there for a friend.
But no. Little miss I want the limelight has to be seen with the famous peeps. witch.
I don't have children, but I still go to my best friends kiddies birthday party's. I'm not keen on being the (what I feel like) weirdo in the corner with no children at a kids party, but I go because she wants me there and I love her kids. I wouldn't dream of fobbing her off for someone else who I barely know!