I can’t help you write your speech, but I can say that I am a teen myself, and I could simply answer this for you. Giving a phone to a teen makes them feel like they are given something to do. Also, it comforts them because they know they have a way of getting in contact with the person that makes them happy or the person that they love very much.
The descriptions, actions, and quotations tell me that Diane France is quick-thinking and resourceful. She uses cleverness to be successful at work. She is also dedicated to her job and curious.