They look very old, I'd be more concerned about her attitude, the service, venue, does she take drugs...etc
Self-harming is surprisingly more common than we all think, my ex-girlfriend used to do it in School, she was very open about it when we started dating but sometimes she would try to hide it, least before we started dating.
Think it's more likely she had some other issues, maybe as a teenager and that is where the scars come from.