On the other hand her complaining may be her way of reaching out and a book about finances will be a slap in the face. Some people can’t ask for help if they were drowning, but they would grab the life preserver if it was randomly thrown their way. Maybe in some round about way offer the services of a trusted collegue. It is always easier to open up to someone you trust, problem is if that someone is a friend, it could ruin the friendship. Just a thought.