1. It's none of your business how other people choose to live their lives. If you don't like hearing about it don't go near her. If you have to be around her tune it out.
2. You're quite possibly missing the point. She may be using his schedule as an easy excuse to get out of doing what others want her to do. Don't be misled by times when it looks like she really wants to participate, it could be just a cover. Maybe she/they would rather keep their lives to themselves.