Her being a nutcase and leaking shit go hand-in-hand. If you don't think they knew how much of a loon Mikeneko was when they fired her, you must not remember all the leaks that came out during that time. A lot of which were implying she was leaking personal shit about the talents.
Whether it was Kanata's choice or not, distancing herself from someone who was diving headfirst into interacting with someone like that was the right move. Kson certainly seemed to regret everything with Nazuna in the end, too.