Talking On The Typewriter

My Oldest One started school back on July 18 and is attending a new middle school. Obviously she's made some new friends by the amount of time she spends texting on her cell phone. Last night after dinner, she kept receiving messages and in turn sent replies back. I asked if the messages were coming from multiple persons and she said no, just one person. Since they had already sent about twenty messages in a span of fifteen minutes I asked wouldn't it be easier to just call them and talk on the phone? Her reply was no, they don't like talking. I don't get it.