I guess this is one of my pet peeves.. I don't mind my close friends discussing my private life; but acquaintances and casual friends crossing the privacy line irks me. I realize there's nothing I can do to stop the gossip... Maybe I just feel better not condoning poor manners.
I don't consider this gossip. Why is friends commenting an an obvious change to OPs physical appearance considered gossip? If I were to lose my job, get a new car, cut all my hair off, gain 50 pounds - whatever it may be, I would naturally expect my friends and family to take notice and comment on it. It's normal. People do it all the time. Gossip implies malicious intent and it didn't sound to me like her friends were being malicious. Also, the quickest way to stop gossip/speculation/discussion, is by putting it all out there.