I think what she is saying is partly true. 

First, Medium of communication = English. Doesn't make you any more American or British. Think about it rationally. It is just a form of expression. To provide to a bigger mass of people, nothing beats English. Of course if you all learnt Mandarin Chinese, she'd be speaking in that too probably.

Second, Accent. What the hell is wrong with speaking with an accent? It is not at all about accent, rather expressions. If you are trying too hard to sound like one of the "Americans" or "British", you are probably not sounding like them anyway and making a fool out of yourself. Nobody judges you by the way you speak, accented or not. Rather the content and expressive nature of your talks is what reflects your personality to them. 

So stop fighting over petty little things. When the world is upto finding world's problems and solving it, it sounds a little concerning that we are busy fighting over things like "You shouldnt have danced on this number, You have to speak in Nepali, Your English is accented, Dont wear those clothes" Oh and Buddha was definitely born in Nepal.