The young student has an insatiable appetite for education, and is willing to learn anything that Princess Celestia has to teach her. She listens, enraptured, to even the smallest bit of information, even if it is as dry as proposed legislation for a new trade mission to the griffons. As far as she is concerned, her teacher is the wellspring of all knowledge.
Celestia plays along, amused. She knows that there is no thing as wasted knowledge. Perhaps this information could be useful some day for the filly.