They can't force you to remember something that you "don't remember."
They can’t make you remember. All they can do is find you guilty and throw you in jail... and make you wish you might have had a memory.
Unless she has previously indicated knowledge of the question topic during previous questioning or in previous writings.
Sure she can, and in Response Issa can say, ‘Fine, you wish to play that way so be it, we have your testimony dated... and we have your written testimony that you agreed yesterday was in fact your answers to our questions. If you don’t care to help us clear up the discrepencies in the testimony and facts that the IG presented along with other witnesses we deposed over the last week we will now proceed to vote on a count of perjury.
He could do that after every question. All Day. Every two or three perjury counts he could add another count of obstruction of congress charge.