Creating boundaries for client and helping them to rise to the occasion


I have a client that I have been coaching now for about 3 months. (I am a weight coach for dentists). The client frequently arrives late to sessions. She seems to be deriving value from the sessions and her level of awareness has been gradually increasing. That said – I want to hold boundaries for our sessions and encourage/challenge the client to show up on time and commit to being fully present for the sessions. Last week I mentioned to the client that I was noticing that she was frequently late to our sessions and asked her if there was an alternative day/time that would work better for her, and she said no. Should I just release the reins and not own this problem? How do I do this?Should I just release the reins and not own this problem? How do I do this? Thanks!