>>3430722But she did help. She brought him food so he wouldn't starve. He also willingly signed up for her project, indicating that he wanted to change. If he didn't want to change, then change wouldn't happen. Without joining the project, he may not have ever tried to change.
Of course, the money would run out eventually. If it weren't for Yamazaki and Senpai, I think she could've gotten him to work with her at the manga store somewhat easily/earlier. He had no problem on their date because of her; work would be just as simple.
Even if you want to argue that she didn't make a difference, Yamazaki and Senpai overwhelmingly brought him down and she was left to pick up the pieces. Doesn't help that Sato's an idiot, but just excising them would have resulted in improvement.