No offense, but you do not get it and that doesn't lead me to rationally expect you to find any potential defenses to the Mortgagee's claims of interest in the real property.  

They are a business after all and should deal with your friend rationally.

From a rational perspective, if it was "uninhabitable" why would she stay for 7 months.. maybe 1, and then move out.. but 7?  

Its speculative, the market is small so one player's actions can have an out sized impact ( Think the host of hedge funds attacking various currencies around the world in the mid 1990's), and you are at the whims of a bunch of non rational players, like Account Closed mentioned with the Brexit voters.

The meters use rational numbers to describe irrational numbers; you can get really really close but very difficult to be absolutely precise (always going to have a +/- tolerance).As others have pointed out, if the meter ticked over ever time 'any' water moved through the system, every hand wash, glass of water, tooth brushing would get dinged.

Understanding that the number$ don't lie, and not to argue with them (rationalize a bad deal as a good one).Sometimes the best deal you make, is the one you don't.

This discussions is far too rational to be about money and politics, :D

The payout is always huge compared to what a normal person makes.The hype is what causes rational people to buy in a "over heated" market.

You will hear rationalization such as, "it is different this time." 

When people get frustrated it's because their want is overwhelming the rational part of their brain.