I'm not on the council, but I would just like to add my own two cents in.
I vote she be stripped of the bijuu.
My reasoning is that in my eyes, she has been inactive. She has gone inactive on multiple occasions, and on each occasion, she has stated that Rakudo take the reign as acting Mizukage. I personally find it BS that she basically gets busy in real life, goes on hiatus w/Rakudo in her stead, then comes back and just takes back all her titles, goodies, etc. True, we all do have a life that we have to attend to, but when you become busy, and you know you're going to be busy enough to have to have someone become temporary kage for you, then that's what I think qualifies as inactive. Going back to why I had originally passed kage-ship on to Ranketsu years ago was because I knew that I was going to be incredibly busy with school, work, and club officer duties, so I knew I wouldn't be able to dedicate time to both SL, and SLS (which, at that time, was attempting to start up). I passed it on so that someone who is more active can instead do a better job at spurring RP, taking care of stuff, etc.
When I had called her out on inactivity some months ago, she suddenly came back with fervor, saying that things have changed and she's back to being active, and for a while, I believed her. But then what happened almost a month or two later? She disappeared and Rakudo became acting Mizukage, again.
Additionally, if she is inactive to the point where it makes her unable to fulfill challenges for the bijuu, that is problematic. Being a jinchuuriki, it's understood that yeah, people are going to be challenging you all the time for it, so you have to be ready to defend it. Not being able to respond to challenges due to inactivity then makes the bijuu no better than if it were stuffed in a sealed pot.
She may be busy in real life, and I hope things are going okay for her, but Ranketsu's sporadic periods of activity have gotten to the point where it's just become an issue. Whenever her power or things in her possession are threatened, she conveniently seems to show up to say that she's going to be active again. Quite honestly, I think that if she is going to be active again, then as Kayenta mentioned, Ranketsu can just re-challenge them for the bijuu.