The context of the following conversation is Addison provided Kendall the correct answer, so she could graduate with them.:
Kendall says I'm so lucky to have a friend like Addison..
The friend responds Why?.
Kendall responds Well, if not for her, I wouldn't have been able to graduate. She gave me the answer to the exam that my whole grade hung upon..
The friend responds This is nice of her, to help you.