Which territory does Ms. Laura Callahan's direct supervisor work in? Give the name of the territory.
Ms. refers to TitleOfCourtesy = 'Ms'; ReportsTo’ represents a hierarchical relationship where the person being reported to is usually the direct supervisor of the reporter; name of the territory refers to TerritoryDescription;
SELECT T3.TerritoryDescription FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID INNER JOIN Territories AS T3 ON T2.TerritoryID = T3.TerritoryID WHERE T1.EmployeeID = ( SELECT ReportsTo FROM Employees WHERE TitleOfCourtesy = 'Ms.' AND FirstName = 'Laura' AND LastName = 'Callahan' )