In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: Dear editor, Mary is my friend and she is a very good-hearted girl. She's always the first to help out others. But her habits make me mad sometimes and she just won't change her ways. For most situations, that's just fine with me, as I know it's what make her who she is. However, sometimes it's just so hard for me to bear her behavior. She has recently got a cellphone, but she often borrows mine to make calls. My phone has a chain with it. She always tries to open it like her own phone. I usually open it for her, but not always, as sometimes I'm driving my car, so she needs to get it out of my purse and open it herself. This weekend we were at a party in a faraway village. She borrowed my cellphone. As it was cold outside, I let her take it outside without opening it. Now it's broken because she didn't open it properly. I wouldn't be so mad, but over the weekend she also borrowed my car and never offered to pay for the gas, which made me very angry. She should have offered to pay for the gas. As I have mentioned, she's the type to help out others when and where she can. Perhaps because of that, she thinks others should also do the same for her. Sometimes I just think she is very childish. I don't want to hurt her, but I do want to let her know that not everyone can accept that. What should I do to let her know that? Yours, Lily
Answer: To ask for advice from an editor.
What is Lily's purpose in writing this letter?