I don't recall her ever testifying, and looking through the program synopsis book, I saw no mention of it in any of the episodes (but I only did a quick scan). I think Luciaphil is right - Miss Bennett did her number of shows and that was it - off she went to shop, dust, vacuum and get that pile of laundry done. Even movie stars need clean clothes.
Did Naomi (Jean Simmons) testify in the '91 revival? I remember her being at the trial.
Gerard