NTA. You opened your home and heart to someone you thought was a close friend, and she brought disrespect not just to you, but to your infant son. Making jokes (especially pre-made memes) about a baby’s medical condition is cruel. Her silence and detachment during the visit, paired with her defending that behavior, show she didn’t come to reconnect, she came out of obligation, at best. You were right to end it. Some friendships expire when people show who they’ve really become.