Who's protecting Hillary?

I got to thinking the other day: who is in charge of protecting Secretary of State Hillary Rodham Clinton? The Secretary of State is protected by special agents of the Bureau of Diplomatic Security within the State Department. However, as a former first lady, Mrs. Clinton is entitled to lifetime protection by the U.S. Secret Service. I imagine this poses a bit of a turf war between the State Department and the Department of Homeland Security, deciding who it's protecting - the Secretary of State or the former First Lady?