What breakdown? ^
Anyway I also think she has matured, because she is thinking with her Avatar brain. When dealing with the civil war, she was only thinking of her family's wellbeing, and it even seemed like she forgot about the dark spirit conflict. :/
Ok not breakdown, bad choice of word. More like her temper was boiling red hot when she should remain calm and don't take it on Mako, which that actually happened. When you think about it, it was crazy to do more fuel to fire by asking others to assist in combat rather than something else, which shockingly I agree with Mako on that one. Yes, the situation was getting bad, but don't add fuel to a fire. Everyone has their faults in the previous episodes, bad or sad, but Korra just got carried away. Now, well she get it and I'm glad for this short amnesia trip happened. So, things may start to bounce back.
I noticed that everyone are losing themselves in their own ways, which I should have seen it coming since episode 1. Bolin was losing fame in the game or rather getting a different fame of being the worst team that lost in matters of second. Now, his ego is showing (kissed the girl as not being in the script, want to be called a fictional guy name) and yeah, he actually said nope to his own brother while he was enjoying in pool. Asami was hinted that her company was going down but she kept her head up and hope for rebound but when walking away, she looked sad that it may never happened. After robbery, she lost everything and pretty much hitting to her lowest point, seeking for security, hence the kiss. Now, she's happy again but at what cost. So, honestly, despite some displayment of characters in the series, it's actually pretty good. Again, some can be handled well, but it would seem like everyone are heading for development and wakeup from their own situations. Mako is actually doing stuff, even though it is arguable that everyone got stepped down but really it make sense. Only one that doesn't unless proven otherwise is Lin. I don't know why she's like this now, but I guess the makers don't know what to sidelined her for Mako but who knows. So hopefully, the next episode or so will be beginning of rebound.