Pretty sure it’s a mental illness; she keeps doing it in the middle of the night and seems angry like she’s talking to her self but really loudly. The same words over and over again likes she gets some kind of satisfaction from doing it. 

She also gets really angry when being told to stop or be quiet, but goes back into her home like she cares a little? (Maybe? Not sure).

Was wandering what mental illness she would most likely be diagnosed as, as I wouldn’t want to make the wrong move if I ever approached her. Thanks.