It is described in the film that to help her friend prepare relevant matters of wedding, an Indian girl went to America which is strange to her.
She is not good at English so she always faces up with difficulties about orders. Besides, she is looked upon by other clerks and complained by diners who wait in line. Finally, crying, she runs out for she can't stand the embassered situation there.
After watching film, my heart is full of sorrow, and I imagine what I would do in face of similar situation.
In a word, it is critical to learn international language--English.