Helping others is very important. The help given to others is often returned as well, creating positive ties and trust with others. Because it's important to know not everyone is as lucky as you are.Helping others is important because it gives others the opportunity to help you feel better about yourself.
She changes her attitude because the book called "Little Woman" says "Amy is harassed by her aunt’s speaking parrot and finds herself miserable." And the really bad rules that she had to live with.