How to deal w/ clients who talk non-stop during sessions (even if you get them out of breaths)?
Just read your last comment about the only time she compromises safety and correctness (and the goal)…. One guess is your client may be talking to get out of a difficult portion of her workout. Another strategy for you would be to sit down with her and reevaluate her goals and what her–and your–expectations are for the sessions.
She may have given you a goal to achieve, but perhaps she is not ready for the work it entails.
Good luck!