Master the skill for two reasons.

In the past, she had made all the efforts to win Ryan's heart. But in the end, all her efforts served her no purpose because ultimately Ryan never cared to even acknowledge her even briefly. 

To him, it never mattered. 

She would cook him the lunches and send them over so that he could realize how accommodating she was to him and the arrangement that was forced upon both of them. But it was not soon she came to know that he had long decided to believe what he wanted to. No words from her would make him see things otherwise. 

He disrespected her, her gestures and efforts each time, making her lose confidence in the skill that she learnt to impress him. 

And it wasn't long after, she seized to do things willingly. Later she did all just to make sure her mother didn't rant to her for not making any efforts to make the arrangement work.