The article doesn't say that. This is probably the culmination of eight years of grief that the pastor has endured from this woman.
It doesn't say why she wants to look at the books. The reason is likely something kooky, like checking to see if the pastor donates to the Masons or the Illuminati.
I would never be suspicious of anyone who wants to look at the financial records. I am suspicious of a church that hides them.
Your comments are inspiring me to think that this lady is on to something; that the Pastor is covering up some sort of malfeasance.