Motiveless Learning

There is a girl at one of my classes who never seems to pay enough attention to my instructions. I have noticed since the first day she came to my class that most of the time she looks down at her cellphone, always looking busy fiddling with her phone by pressing the number keys without a stop. I guess she might be thinking that I didn't notice what she was doing, but unfortunately I did. I just feel sorry for her and her parents who must have paid a lot to send her here for language learning. If she does this in my class, she may do the same at others. So why waste time here if she doesn't like the class?