She was free to express herself in a way that was not possible in the classroom. Having individual keypals allows even the shyest students to be heard from in a very strong way. Those are some of the questions that teachers involved in a keypal exchange will want to answer before the exchange begins. An agreement between teachers on the frequency of communication is essential too. One of the biggest causes of keypal failure is that teachers underestimate the amount of time they'll need to put into managing the exchange.
Many teachers use the keypal program to reinforce writing-process skills.
In some cases, all correspondence is filtered through the teacher. Those things take time. For the exchange to be successful, no student should be disappointed, and overseeing this factor is a very large commitment for the teacher. Such an exchange is easy to set up and manage. Or you might consider having your students write to an older group of students in your school.