She has been on Keen for a long time and I can't give a review because I have never read with her.  However, I have never seen her call button on - chat only with her.  I don't get readers who only do chat....why?  I personally feel chat is to expensive.  I feel rushed when I try chat and I don't feel like I convey my thoughts and questions correctly.  Plus the clock is running while I am waiting for them to read and respond.  just my opinion.