JULIE-since you said she's "a lady that I know" I'm figuring she's not an actual FRIEND anyway-right? Don't sweat her opinion-it doesn't matter. Is she overweight? Often our successmakes others face their own demons/jealousy/etc.
Now..YOU need to stop saying the mutual friend "has lost 260 lbs all her own", because DOES make it sound like YOU think you did something "wrong". KUDOS to your friend for taking charge of her life/health, but betcha she had SOME kind of help, though non-surgical (perhaps dietician/WW/trainer/etc). I pray she is able to maintain the loss, long term, but I think we all know how successful WE were at that.
You ABSOLUTELY will want to talk about your WLS, and how it improves your health-and you should feel free to. You never know whom you might help. Do you belong to a "in real life" support group? There's nothing equal to being able to sit with peeps who truly UNDERSTAND dumping/foamies/tube sock boobs/snarky friends. If there is not a local group-START ONE. OH can get you started-it's truly easy, and very rewarding.
Hang in there-you're a beautiful lady, and have LOTS to share!!!!