Help with German Exchange Student?

Learning English was probably one of the main reasons why the German girl decided to become an exchange student, so don't worry about being able to speak German to her! In fact, she may want to only communicate in English so that she gets better. Be patient and explain things clearly if she doesn't understand you. If you want to show her that you're interested in her culture, you can look up some greetings in German and, of course, ask her questions! Have fun.