For one thing, she would be helping others and making friends at the same time. For another, to teach is to learn; when you give instruction to others, you come to realize that you can't explain anything that you don't understand thoroughly yourself. By helping others, you also develop your ability to express yourself.
我的觀念是：這樣做非但幫助了別人、且能夠贏得別人的友誼，對人際關係很有幫助；且教學相長，透過教導別人，你更能夠徹底的瞭解，一知半解是沒有辦法講解給別人聽的，也能藉機磨練自己的表達能力，可是她一點都不能接受。