For me, especially after Aftermath, the way Murphy acted Made Sense. Because to me it comes off as the multitude of trust issues she's shown all through the series that DID mellow out for a good while all raising their ugly head at one go accompanied with a good deal of resentment for having to work with Marcone and having the last vestiges of normalcy - he job, that is - taken away. The last part being, imho, the most influental one in shaking murphy to the core and giving the other crap room to fester