since that is exactly what she was lying, or confused about, i fail to see how asking it one more time would help.
in fact, the state prosecutors probably asked her that question a bajillion times, as part of qualifying her as an expert witness.
(added: in case you don't know, i'd like to clarify that qualifying expert witnesses occurs in open court. the defense, judge, jury, anyone watching the case, etc would all hear the question asked, and her answer. this would come after a copy of her CV, including relevant degrees, was submitted.)
EDIT: Oath. I've been working too much recently.