Probably plenty of stuff. How many operations are going at once? As she said, she was more interested in who killed Terry. And why wouldn't she be.
But what I find objectionable most about Issa is that he won't let her answer the question properly. You and I, and anybody with any sense of intelligence, knows that a simple 'yes' or 'no' doesn't suffice. All it will get him is a cheap political point. He tried to do the same with Issa...
I won't even go into the fact he actually spends the first three minutes making a statement, not asking a question (thus me saying he likes the sound of his own voice)...
With respect to Issa, his questioning methodology is no different than any other congress critter who has been part of a congressional panel questioning witnesses. That's what they ALL do. ANYONE who is subpoenaed to testify to Congress should expect that. That's how they do it.
And, the witnesses' answers are also expected in writing. Congresscritters dream for this stuff in an election year. Otherwise, most of the fact-finding can be done in writing.
So, any [R] or any [D] would have the same methodology.
As to what JN was doing during those three months, are you not wondering why she felt no need to inform Holder? And, when an agent is killed in the line of duty - irrespective of whether that death happened as a result of the start-up of a previously failed operation or not - I have to suspend disbelief that that item is not at the top of all involved agencies' list of agenda items for the weekly briefings.