I have a friend who has a bad habit of messaging at 9, 10 or even 11 o’clock at night asking if I can chat on the phone right now. Sometimes I am shattered and just want to rest before going to bed. Usually when she chats it’s about something minor that she has blown out of proportion. She has messaged now asking if I am free and I said I am at the supermarket. I have not read the next reply but know it will say what time am I back because she wants to talk. No other friend does this so why does she think I am free 24/7 counselling service. What is the best response?