Its hard to tell in the photos. The dress looks beautiful on you. I'd say do what you can in the next two weeks... but I don't think 10lbs is feasible in 2 weeks time... its really only healthy to lose 1-2lbs per week... and even if you do, will it be feasible to keep it off until the wedding? So do your best in the next two weeks and if it needs to be let out, its not that big of a deal, you want the dress to look perfect on you and I am sure that's what the seamstress wants too, I am sure she didn't mean to hurt your feelings, her job is make the dress fit the best possible and make you look the best possible. She is the professional, I'd trust her.