From this it’s pretty obvious that she doesn’t want to take it as a long time friendship. She is just using for time pass as per your thread. That means she doesn’t want any long lasting friendship. Whatever she/he writes is a soft copy which can later turn against them. The stakes are pretty much higher for her given she has a family. Yes, this is exactly what I told. Virtual relationship which are platonic wil be good only if there is transparency between the couple. The husband/ wife should be aware that they are friends and even if they don’t interact just a word put into their ears about the friendship will be needed. There are plenty of online resources about emotional cheating or friendship. As lots told it’s a thin line but can be maintained only if the partners are transparent. Friendship will last only if the trust between couple is strong and transparent. Anyhow it’s her life and she is at liberty to choose the way she likes. Good luck to her.