In *Order of the Phoenix*, while Umbridge thinks Harry is under veritaserum effect, she asks him where Sirius is hidden.

Then,

* If she stills thinks Sirius is guilty and wants to kill Harry
	+ She should have interpreted Sirius using floo powder to get into Gryffindor Common Room as an attempt to kill Harry.
	+ Harry should have no idea where Sirius is, so there is no point in asking it.
* If she thinks Sirius is innocent, and a friend of Harry
	+ She should have interpreted Sirius using floo powder to get into Gryffindor Common Room as an attempt to talk with Harry.
	+ Harry may know where Sirius is.
	+ There is no point in attempting to capture Sirius if he is innocent.

So neither option makes sense to me. Why did she ask that question?