If when giving the new T feedback about your appointments you keep it specific anfd concrete, rather than draw conclusions from it, e.g saying what a pity the doorknob is broken, and that due to the way your hearing works you would like her to speak loudly to you, that may help her avoid misinterpretations.

People are so varied.

About the friend, I suggest you set yourself a rough timetable to see her and say that you only have time to meet her once every couple of months or even better, tell yourself that but don't tell her in those terms. Her meds and therapy are her affair, if you lose interest in her you can draw your own conclusions about how often to see her.