What does Alex do to help Conner in Chapter Three? Was she right to help him?

In Chapter Three, the twins are taking a quiz in class, and when Conner passes his paper to the front of the room, Alex notices that there is barely anything written on it. In an effort to help her brother, she hurriedly copies some of her answers onto his paper. She feels ill about this afterwards, but in her heart, she knows that it is the right thing to do to keep her brother out of more trouble.