yes sometimes that does irritate me, or how about the ones who think that if they take a pill they'll lose the weight overnight? eeerrrrrrrrrrrr.........
Be supportive, she came to you about this for a reason, cuz she trusts and cares about you. Don't worry about her other friends, it's about you being a good friend to her and not judging.
As with all marriages, they both are claimed as dependants and it's really up to the couple as to who takes who's last name or not, even in straight couples it's like that.