i dont think u should worry at all she sounds like she is content with her lifestyle nbot every baby piles on weight and sometimes they say that to put it in ur head that u need to do more.. if ur really worried take her to ur gp n just get him/her to check her over..
i think it sounds like ur doing everything right some babies are just not meant to gain weight at lightening speed... maybe she jus isnt a chubby bubba.. doesnt mean she isnt healthy or not getting enough milk