Everyone has different study syles/routines. Many people can't understand the other person's methods.
For me and DH, if it's too quiet, we can't concentrate (like another poster said, I will hear other things and then my mind goes wandering). But, I can't stand to hear music so I need the tv on. For DH, he HAS to have music on. For DD, she can't have the tv on - she just can't balance the two (and she is an honor student), but she likes to have music playing.
For my best friend, if there's any noise at all, she can't concentrate.
As in many things in life, people can't understand how someone can do things differently than they do.
As for your DD, if it ain't broke...............