I am surprised at how difficult it has been to emulate her technique. Feeling comfortable asking the obvious questions is one half of the battle, but the other, more difficult half, is knowing what obvious questions to ask. Most of the time when I ask obvious questions, the replies are yes/no. She knew how to ask them in such a way that gets the person talking in greater detail.
It's kind of like being a great interviewer, there's a technique to asking questions in a manner which gets someone talking.