After a while, it'll just become a horrible running gag with Team Avatar. If she makes sure Mako and Korra are secured across the room, I am sure Bolin will be able to keep Korra occupied. XD

It was fire, then ground (or water?) followed by air and whatever was left. I do think the other half will be forced. Once the third one is forced, I think she'll have to go and get help from Korra while Tenzin and Lin are busy making out in her office...I mean doing important stuff. There could be a last ditch effort to control her but I don't see it being too extreme though there could also be some kind of injection given to her without her knowledge that could send the elements into a mock-Avatar berserker state. Then she'd probably be beyond her own control that way.