Money to burn...

We've established that my Monster-in-Law spends money like there's no tomorrow, but the latest thing even stumps me...  She has decided that she wants to build an addition on her house.  Now you have to understand that she has a 2600 square foot house that she lives in less than half of the year... by herself!  Now, this project will easily cost from $90 to $120k.  This is a second home people!!!  Words can't describe how much of a waste this is.  She paid too much for the house in 2006, just wasted 30k on new bathrooms (the house is like 5 years old) and now this.  She pouted and cried when I told her it was a bad idea.  Go figure.