<human>: I'll start.

Mr. Smith (names changed) tried to convince my mom that he would pay for her lunch if she went out with him to eat. She was skeptical because he was really weird, and she had bad experiences with him in the past. She told him that she couldn't go because she was really tight on money, and it was a week until the end of the month, but she was hungry, and Mr. Smith seemed sincere, so she went with him anyway. 

After they ate Mr. Smith's credit card got denied, leaving her to pay for them both. Having to do this basically left her with nothing. She told some of her friends what Mr. Smith did to her, and that she didn't know how she would make it though this next week, without any money. Later that day she found [this] in a letter that was on her desk, without a name attached. This made her cry for about 30 minutes afterwards. She said it was one of nicest things anyone has done for her.

Can you condense the text into three sentences or less?
<bot>: My mom found [this] letter on her desk after telling her friends she was struggling to make it though this month, because of something a man did to her.