The company I work for is changing who I report to from the VP of Financial Services to someone only 6weeks?

Im their Systems Financial Manager and handle all their Accounts Payable's and a list of other stuff. They are having me report to a new AR manager who has only been here 6 weeks and doesnt know much about her job ? My old boss who I did report 2 was the VP of Financial Services. I know more about the job then this new employee b/c I've been here for 2 years why would they do that??