I would never be suspicious of anyone who wants to look at the financial records. I am suspicious of a church that hides them.
It seems to me that this particular person wants to look at the books to get something on the pastor; thus her request for his personnel file. The article also doesn't say that she donates any money herself.
The fact that a conservative bishop, DiLorenzo, backs this pastor with his diocesan attorney indicates to me that the lady has too much time on her hands, and the bishop would rather she spend it somewhere else.